I'm just going to say this now.. you guys are thinking about this way to hard.

Since V22 is the base you can start from, you need to rewrite AV from scratch, then you have to rewrite parts of AMH to account for timing differences. Oh and something else.. you will also need to worry about the sound system due to the limited program space on the propeller.

AV will need to be highly optimized and you'll need to write it in propeller ASM.

As much as I would love to do this myself, I have too many other things going on. Unless of course all 150 owners wanted color