Hi Evan,
This sounds like a fun project!
I checked out this page: http://www.evilmadscientist.com/2008/an-arduino-library-for-peggy-2/ and I think this is something I could do in 30 minutes to an hour. I haven’t finished building my Peggy2 yet, though, so I won’t be able to test my work unless I have your board in hand.
Are you local to the bay area?
PM me your contact details if you’d like to talk about it.
-David