Has anyone ever thought about driving a Kenwood CD-Changer bus from the empeg. (and not the othe way around)

The reason I ask is that Kenwood makes Sirius Tuners (and probably XM, but I'm a Sirius subscriber) that live on the changer bus. They have the advantage of being cheap, ($50) and having a relatively well-known interface. There are lots of interface boxes that go from OEM head units to the Kenwood bus, just not the one I really want: RS-232.

TimeTrax has announced a USB interface, but that doesn't quite help either.

The Kenwood bus is sync. serial, but I don't know if this is something that could reasonably be implemented in a PIC, or if this ia a more major project.

Any thoughts/wisdom/laughter/interest?

-Z