Very nice critor!
Out of curiosity, what happens when you put the 84+ keypad in?
With a TI-Nspire CAS TouchPad and OS 2.X.X:
* basic TouchPad keypad -> after booting, dialog box saying "unrecognised keypad -> install a TI certified keypad or update OS"
* ClickPad keypad -> loop of reboots
* 84+ keypad -> booting ok, but of course wrong keymap