I'm looking to buy a tiny 3.5 mm A/B switch for use in my car, but I don't think such a thing exists.

All I ever listen to in my car is either my Sirius satellite radio using the built-in FM transmitter or my vibez through a cassette adapter. (Yes, I know, not very elegant but it works.)

Because I do occassionally hit FM radio interference listening to the satellite, I'd like to have both the Sirius and the vibez plugged in to the cassette adapter at the same time through an a/b switch.

So, does this sound doable? Any alternative recommendations?

Thanks.