Start with a compact TKL (Tenkeyless) mechanical keyboard.
Put a Pyra touchscreen above the F5-F11 keys.
Put a Pyra's nubs & game controls to the left/right of that (shoulder buttons on the back edges even).
That is the general concept - yes. I'm inclined to use an old Thinkpad 7 row tenkeyless arrangement - but add the nubs into that and you have the right concept.