ED said he had been missing äüö when i showed him that there was a way to input those in the standard places. There isnt anything better than that to be had, so we can safely assume it covers the criteria.
I had some time this morning:
http://www.keyboard-layout-editor.com/#/layouts/a3e2660eadba25a17a99dbeabaccb742
Reinstating the lost coding keys with altGr isnt a bad idea, because thats what AltGr does on a regular keyboard (one that isnt US layout)
I also tested shift+altGr and found it to actually do something by default, which was interesting. You can then reinstate the second letter on the coding cluster aswell.
So if you want regional stuff on those keys, altGr is the regularclick, and shift+altGr is the shiftclick.
That is if you dont want to switch layouts back and forth.
Its not very pretty, nor is the F11 or F12, but its not too ugly either, and it works.
I thought about F11 on tab and enter or backspace enter. But i dont know about that.
Missing insert Was FN+backspace ok for insert on pandora? Its not really something everyone needs to know about, so it doesn't have to be marked.
Would be nice to have a '
Clean altGr on 2490 would be nice for french, but 2 is the german "
Those are the issues right now, modified number row is currently not a big deal in the vote. Would be nice with more votes.
http://www.keyboard-layout-editor.com/#/layouts/dffea81eb103bf040b20793c128848df
Only AltGr to reinstate, its things you need though, so its a bit iffy. Even though ' is better for english, anyone else is pretty much required to write english, so it becomes a bit of a hack for non-hacky people.
only 1 dead-key per key, little bit better for english as far as frequency goes. Its all over the place though, doesn't seem welcoming to use.