I like some of your ideas, I never even thought of using it for a keyboard.
some points though:
having a headset plugged in with a wire going from your face to your possibly moving hand would be a problem... perhaps if there was a small plug in reciever for the remote, and the headset was wireless... if it used radiowaves like the wavebird then the batteries needed for the headset would last ages.
Wiimote-Wiimote connection? I don't understand what you mean with this at all, there is no need to connect two Wiimotes because info can be sent from 1 to the console and back to another anyway.