My BMW dealer has told me that the BMW blue tooth headset for the R1200RT (2011-2012) will only work with a Schuberth helmet. Additionally I was told that the BMW-Garmin GPS will not cut in on the audio system. The suggestion was that I use the GPS without blue tooth. What blue tooth actually works with the BMW audio system and the the BMW-GPS? Also, I don't feel that I actually need a $600.00 helmet to use the BMW blue tooth system. Suggestions please.