Wayne, I wanted the same thing. I went with starcom1. The starcom1 is an interface unit that allows all com gear to be wired into the interface and only have the head set and mic in your helmet. I have bluetooth phone, garmin 478 chart plotter with next rad radar, Jensen heavy duty radio, and bike to bike communication via gtx radios. The Jensen and Garmin are both water proof. The passenger has the ability to have seperate music and phone source while keeping full duplex intercom system. I have a seperate volume control for the system so I can shut it down at stop signs etc. I have a seperate push to talk button for the bike to bike to isolate it from the vox for phone and intercom.
It can become expensive but once you have it you will never use anything else. The pic is from my bike and I am about to do the same thing for the spyder. The mix-it2 is 160.00 while the starcom1 is about 400.00