If you're looking to connect 2 devices simultaneously and still be able to listen to them both, you're going to need an intercom or similar audio interface device of some sort.

We use autocom on our bikes and have both satellite radio and FRS radios hooked up so we can talk and listen to music.

I read that chatterbox is supposed to be coming out with a wireless bluetooth unit in the fall (see Aerostich catalog for a pic of the unit)...and not just for a phone...no wires between the headset and the main unit.