Why not get a head unit that can play MP3 CDs or has a 3.5mm Aux input? That would solve your problem quite nicely.
All my cars over the years have simply been called The MartiniMobile, regardless of make, model, year, etc.
I wanted to get a keychain fob that would play the scene change music from the 1960s Batman TV show, so then I could say “To the MartiniMobile!” and play that music. Alas, I never found one, so I have to make to with imagining that’s what’s happening instead. 