I can recall a (good) few years ago, Micronik did just that, so its definately possible.
I may be wrong, but I think there were some docs on aminet under hard/hack..
However, as a standard A1200 keyboard has the rollover bug, are you sure this is what you really want? There are a plethora of PC->amiga key adapters for this job, and you can get a PC keyboard for under a tenner, go cordless etc.
Of course, you lose the amiga keys in favour of Windoze (urgh) ones, so I appreciate any reticence to adopt this route :-)
