a.mlw.walker:
Hmm doesnt sound very easy to get hold of
I am not saying get one. I am saying this is how your original idea is not so original and how to wire it up in order for it to actually work.
ir receiver's currently winning. Any cons to it?
Have you priced it up? How many keys are you after?
This will be many orders of magnitude more expensive than actually buying a keyboard and the results will not be as good.