I spoke directly to Autocom this morning who confirmed that their Pro AVI unit can indeed be installed in the manner I wish viz:- integrating all bike audio functions and providing a bike to bike facility although this requires a separate transceiver (walkie-talkie pair). They also do installation work at their place in Warwick including putting the headsets into helmets which might be valuable if the installation in the BMW System 5 is difficult.

Finding it still difficult to believe that the installation in the BMW helmet would be all that difficult, I took myself off this morning to Caterham where a BMW dealer (South London Motorcycles) lives, only to find that their helmet expert is taking his summer holiday.. However, one of the service guys showed me how to remove the visor and the flip up jawpiece, and the cheek pads so I am more confident than before. Plus a bonus, I discovered an Autocom document that deals with the installation in a system 5 helmet. I think people who have been telling me that the BMW helemt is difficult is because they have assumed it was the same as the Scuberth helmets (and Schuberth make the BMW helmet), however, the fit is very different. I wanted to get a Schuberth helmet but none suited me, whereas the BMW one is very comfortable.