Interesting topic
vastano. Hopefully someone with a F15/F85 factory installed CarPlay can chime in with what's possible and/or correctable. This way we have a more realistic expectation from this retrofit.
While this doesn't address all the questions you posted, I found this thread over on the G03 forum:
https://x3.xbimmers.com/forums/showthread.php?t=1640460 Even the G05 forum have something to say about it:
https://g05.bimmerpost.com/forums/sh....php?t=1545438
In the mean time, I'll browse a few more F/G forums to find more info...hth