Forgive me if this has been addressed here elsewhere, but I've searched and could not find it... I have my Schuberth's SRC paired to my Zumo 550 successfully. Can I plug a BT dongle into the 550's cradle, pair that to the SRC, and get stereo from my 550's XM receiver? I know the 550 doesn't support BT stereo on its own, but will the helmet "see" both the Zumo and the dongle at the same time? The SRC's manual says you can pair it to both a GPS and a phone at the same time, so I'm assuming it will, but I bet someone here has already tried it, eh?