Have had similar discussions with Hitachi who are supplying my company car. Initially I was told they wouldn't do it at all because they were unhappy about Data Protection. However, after I challenged this they agreed that I could sign a waiver to say that I was happy that the manufacturer/dealer would have access to the information, that Hitachi would have no control over this, and that I had to maintain the car through Hitachi and not anyone else.
Seems to be a fairly straightforward and pragmatic approach. Ultimately, I have to agree to Mercedes knowing this information if I bought the car myself, so I'm just acknowledging that to the leasing company.
The bad news is that the car has been delayed further and probably won't be with my until September though ordered in Jannuary, so still won't be able to use ConnectMe for a while yet!