Larry, appreciate the offer, just getting back around to this. I figured one thing out and the other seems to have resolved itself. I never noticed (and obviously didn't read it in the manual) that you can change which inputs are your favorites, so I fixed that and moved AM to a sub-menu and SXM to the primary menu.
As for the CarPlay taking over and wanting to play apple music instead of leaving SXM, somehow after changing it a few times, it seems to have learned (?) that I want it that way and now Waze comes up and SXM stays my audio source.
I think I'm good for now, but reserve the right to call you if it gets messed up again