Hi there
Are you referring to this (Greek X5 owner) http://www.xoutpost.com/437585-post7.html

I had this retrofit done, but I didn't had a SEPARATE voice control unit...
Installed a 3rd Gen ULF - (Voice included)
Maybe you can try the NAVCODER software (described well within these forums)..
1. No, the voice will not work without programming (Dealer or NAVCODER)
2. I think that there will not be any problems with keys...
3. NO, only OBD software or dealer or NAVCODER