Interesting idea @cykurtz. Is there a particular reason you want to use a PC keyboard or is it "just because"?
Personally I like keeping my Atari 8-bits as original as possible apart from new storage solutions like SD cards. Otherwise I would just go for Altirra on my Windows computer instead.
If I was going to do something like this though, I would probably be inclined to go for the USB option simply because it is far easier to get a new USB keyboard these days.