>..with Hijack you can remap a button to switch sources

Speaking of which, here is my current favorite remapping (Hijack v190):

Bottom.HL=NextSrc.N,Bottom.UL,null.U

Bottom.CL=Source.N,Bottom.UL,null.U

My Tuner is at home (.H). If yours is in the car, then just reverse the flags like this:

Bottom.CL=NextSrc.N,Bottom.UL,null.U

Bottom.HL=Source.N,Bottom.UL,null.U

-ml