I don't know of any Jackshaft products for that engine/transfer case set but I do know a thing or two about using the bikes pedal side for engine power as I have built a couple shifters, well, over 50 ;-}
http://kcsbikes.com/KCsBuilds.asp?motor=All&shifter=Yes
If you want to post some pics as I have time to help.
KOOL let us know when you get it mounted.........CurtGot it yesterday. Works great, thanks Curt!