I have a couple of bluetooth helmets (Vemar and Schuberth) - has anyone found a widget that will allow a cb radio (likely with an external push-to-talk button) to tie into the bluetooth helmet system?
Check out Parts Express. I just got a catalog and I glanced something that turns any audio input into blutooth. It was a circuit board type of thing, but it might be what you are looking for or at least close to it.