An update on this topic. I have verified a bluetooth adapter that will support both phone and music. The adaptor needs hardware modifications for aircraft use, and I will detail this once I clear away my backlog of other number one priorities.
For those of us who use helmets, bluetooth phone operation is a convenience. The adapter I tested supports iPhones and other phones, plus all types of tablets. It has a small control panel, but it's not necessary to have it accessable if the phone is handy.
It also seems more immune to power noise, so the SkyView USB port can power it directly, if desired.
Watch this space. Here's the updated link with all of the details:
http://www.vx-aviation.com/sprocket/audio.htm
Although I used a PS Engineering intercom, this will work just as well or better with the Dynon intercom. Just for reference, this whole Bluetooth audio system can be built for less than $25, depending on if you want music only or cell phone+music.
Cheers,
Vern Little
Vx Aviation