Immo 3 clocks can be fitted to an immo2 or immo3 car so there is no problem with that. (immo2 can't however be fitted to an immo3 car)
you need to find someone who can code in clocks - some of the guys in here have the software to do it. Some VW/specialist garages should do it too. Ring around, or post your location on here and hope some helpful forum member can code it for you.
Do a search on the forum as there is info on this mod.