Hi Ken,
Yeah, they sound like a nice add-on. I'm planning to use this to integrate my Sonos music system to my jukebox. I'm planning to have Sonos be able to play throughout the house, and the jukebox when there are no selections playing on the jukebox, and to be able to send the Jukebox music through the sonos system when the jukebox is playing.
I've got the connector bodies and pins, and could make the cable if you're interested in selling one of these.