I am using your SR10 in aviation.  It is surprising how much clutter the headset cables are.  So I have the SR10 connect to my aviation 2-way radio via the open end cable. I have the Peltor headset BT connected as well as my cell phone BT connected.  I also (although not recommended by Sena) have my MP3 player connected to Aux 1... I all works great!! (for me).... except for the passenger.

I would gladly sacrifice the cell phone BT connection for a second headset.