Wow - I take a few days to spend with family over the American holiday and a lot has happened here.
There are some very good things going on with this layout:
http://www.keyboard-layout-editor.com/#/layouts/37af15095b2aeedd169b0b5beb3bc9a6
There are also a few things that make it a bit of a train wreck.
No offense intended ED, but it looks like you completely skipped reading the vast majority of the keyboard threads. We all learned a lot. There are a few fundamental things that got skipped. I can provide more lengthy explanations, links, etc upon request on any of the topics. You asked for us to keep this short and I am going to try.
Fn/Meta behavior: The two Fn keys are two different keys with two different needs - but one common behavior. The shoulder Fn needs to create a unique keycode to the OS so that the OS can re-map it to something not Fn-like for games. The keyboard Fn must always perform as Fn. BOTH Fn keys need to behave to the OS as if they were a HARDWARE Fn - i.e. NOT generate just a key code, but instead they must fundamentally change the behavior of the other key pressed. Yes, this can happen at the driver level, but it must happen prior to the OS map.
Fn+Shift is not an option, it is and must be a rule: Every physical key on the keyboard (other than Lshift, Rshift, LFn, RFn, LCtrl, RCtrl, LAlt, RAlt) must have 4 'mappings' or 'layers', even if they are not explicit in the printing on the keys. It is easiest to think of the keyboard as TWO physical keyboards. One is the 'Normal' keyboard where each key has it's unshifted and shifted values. The second keyboard is obtained by pressing Fn. Fn, by it's definition tells the driver, "Switch to the Fn keyboard". The Fn keyboard ALSO has unshifted and shifted values available and should generate codes, whether those are directly mapped to symbols or not. ALL of the keyboard layouts that have F1-F12 keys on the Fn layer do this. Every F1-F12 Fkey MUST be able to be combined as:
Fkey, shift+Fkey, Alt+Fkey, Ctrl+Fkey, Alt+shift+Fkey, Ctrl+Shift+Fkey, Alt+Ctrl+Shift+Fkey, etc...
The fact that shift+Fkey is in that list AND the layouts having F1-F12 on the Fn layer means that Fn+Shift MUST exist.
DosBox, QEMU, X86 compiled Linux programs and "PC Gaming" are all potentially going to be a 'big thing' on the Pyra. Those bring with them a small amount of issues that are MUCH easier to solve now with the keyboard layout than the would be to change later through re-writing and fixing code. They are also another reason why the Fn behavior MUST appear to the OS as if it were a hardware Fn. DosBox and similar go straight to the driver and interpret the keyboard themselves as if it were a US standard layout. They cannot be easily re-mapped in software. What this means is, regardless of what you have mapped to shift+; DosBox will read :. The issue gets more annoying when something is marked that DosBox doesn't understand. Anything you have mapped at a base or Fn layer that isn't a base key will not be read. So, on your layout where Fn+A={ those programs will either do nothing or be confused because there is no { base key on a US keyboard. They'll only see Fn+D=[ IF the Fn is passed as a hard keyboard switch at the driver layer. Many very smart people have tried to 'fix DosBox', none have succeeded. The issue is fundamental in how DosBox reads direct key presses instead of combinations. DosBox is simply the easiest example of this issue, it is not restricted to this one emulator. The whole issue can be cured by, 'Maintaining key pairs from the US keyboard'. This is pretty simple, but DOES require that Fn+Shift be recognized as a 'real thing'.
Fn+Shift is a real thing - and a very handy thing. You will see that the majority of the layouts proposed place Fn and Shift next to each other instead of cross-keyboard on the Pandora. The Pyra has more keys than the Pandora did - and it's a great thing. The fact is, though, it is still short on keys and needs to make use of a second keyboard mapping. So by having Fn and shift next to each other, it becomes possible to chord them. I.e. press both Fn+Shift at the same time as a single press of two keys or 'mashed'. Acknowledging this feature allows the Fn layer's shift modification to be 'opened up'. A hardware-type Fn truly doubles the number of symbols that the Pyra's keyboard can produce. This means that a Fn layer key can produce both upper and lower case letters.
Understanding Fn+Shift gives the Pyra enough keys to map symbols in true US keyboard pairs (DosBox), have the most awesome PC Game controller ever (numbers and F1-F12 on same Fn layer), offer unparalleled international support with simple diacritics all while maintaining unencumbered English usage. It can all be done, but it would require a substantive reconsideration of the current keyboard approach.
http://boards.openpandora.org/topic/16872-and-now-for-something-completely-different-keyboard-option/?p=389806
Ctrl+Insert and Shift+Insert is a real thing. It is part of the CUA standard. It is expected by both Gnome and KDE.
https://en.wikipedia.org/wiki/IBM_Common_User_Access
Pause/Break and PrtSc/SysRq should both be top layer keys.
Pause/Break is often used with Ctrl+Pause and Ctrl+Break. Pause then needs to be accessible with Ctrl.
PrtSc is often used in conjunction with Alt. Alt+PtrSc captures the current window (in Gnome, etc) into the copy/paste buffer. PrtSc then needs to be accessible with Alt.
Esc should be accessible, hard to press on accident and present during game play. My preference is on Fn+ top left key above the left nub.
Keyboard and LCD brightness with control for both up and down can be controlled on a single backlight key.
Normal: Screen backlight increase
Shifted: Screen backlight decrease
Fn: Keyboard backlight increase
Fn+shift: Keyboard backlight decrease
All radios AND USB can be controlled on a single IO Control key.
Normal: WiFi toggle
Shifted: Bluetooth toggle
Fn: USB toggle
Fn+shift: 4g toggle
However, a better method might be to have a 'hardware menu button' that pulls up a hardware menu in the OS. By doing it this way, it allows for many more things to be controlled in a central place without any 'button guessing'. On my more recent layouts I designated it on the top left corner above the nubs with the ≡ symbol.
Diacritics and International support:
There are a series of symbols that are commonly used to designate dead key diacritics.
,< .> /? '" `~
These also just happen to conveniently be US keyboard base pairs.
We also, conveniently, have a keyboard that does key, shift+key, Fn+key, Fn+shift+key.
This allows a certain magic to happen.
Normal `~ key is `
Shift+ `~ key is ~
Fn+ `~ key is the ` dead key for grave diacritics.
Fn+shift+ `~ is the ~ dead key for tilde diacritics.
By keeping these symbols as 'base layer', I.e. NOT on the Fn layer, it enables these 'easy diacritics' to happen.
,< .> /? '" `~
Shift+Shift as ShiftLock
Fn+Fn as FnLock
For the most part we can get around not having a dedicated 'CapsLock' key. However, it would be handy to still be able to lock the shifted layer if the user chose to. To solve this, since we have two shift keys, we can have shift+shift = ShiftLock. If the keyboard is in ShiftLock mode, holding shift then pressing a key would generate the unshifted value.
Similarly, we can do the same thing with Fn+Fn = FnLock. This would bring the Fn keyboard layer 'topside' in much the same way as ShiftLock would bring the shifted layer topside. Holding one Fn button when in FnLock mode would produce the UnFn layer value.
Yes, it would be possible to 'lock' both layers at the same time.
Why would German support be limited to the lowercase of Ü, Ö and Ä? They're letters - and they have an upper and a lower case. Yes, their lower case use is more common. But then, whey relegate these to the Fn layer at all? Why not have them on the top layer where they're just as easy to use as the English letters if it can be done without impacting the English keyboard. And while we're at it - lets put them in the same positions that they reside in on the German keyboard. For the longest time I thought this simply couldn't be done. The Pyra just didn't have enough keys to make it happen. I was wrong - it CAN be done and it should be fantastic.
So, PC gaming is going to be a thing on the Pyra. Halflife is already working on the Pandora using the new X86 Linux emulator code. Two of PC gaming's biggest genres are First Person Shooters (FPS) (Halflife type) and role playing games - often online, often massively multiplayer (Neverwinter Nights, WoW). Something these two genres have in common is extensive use of the number keys 12234567890 AND use of F1-F12. Sometimes BOTH are needed during the same game. Often one series or the other is expected to be easily modified with shift+, ctrl+ alt+. For these types of games, it would be a huge advantage to have both the number keys AND the F1-F12 keys be able to be on the same keyboard layer at the same time. I.e. be able to lock in a 'game mode' on the device to have game controls and all of 1-0 and F1-F12 available. Yep, that can be done too.
All of the above CAN be done. Two variations on that theme showing some of the open options:
http://www.keyboard-layout-editor.com/#/layouts/ee8d3bc8b446f99c027105d3810f8d07
http://www.keyboard-layout-editor.com/#/layouts/b76ffdc065642c07243bad385b4a06a8
Fn behavior understood and accounted for. Check.
DosBox and other software that reads keypresses at a driver-layer compliance. Check.
Ctrl+Ins Shift+Ins capable. Check.
Ctrl+Pause/Break capable. Check.
Alt+PrtSc capable. Check.
Screen and keyboard Backlight controls. Check.
Radio and hardware toggles controlled by easy to find 'Hardware Menu' button. Check.
Complete English support. Check.
Unparalleled German support. Check.
French and German support. Check.
Symbols are more used than numbers. Symbols on the top layer. Check.
EASY diacritics (just look for the dashed circle on the Fn layer). Check.
Non-Germanic language speakers now have a 9 button game pad on the right in 'normal mode'. Check.
FnLock turns on a game mode with the top 2 rows of the keyboard ripe for in-game functions. Check.
With the Pyra you have the opportunity to make a giant leap forward in keyboard design. It really CAN do everything and do it very well. Nothing needs to be kicked to the curb.