Can you get away with MirrorLink? Truthfully I've never tried it, and I'm pretty sure it's dead if not dying, but it was always going to be my fallback if I found a way to leave Google (or potentially Android entirely).
This is the main reason I've stuck with Nexus/Pixel. I've tried Samsung but everything on it is unwanted bloat. Amazing hardware screwed by bloat and duplicated apps. Shame.