[clay68c10]

Originally Posted by fun in dirt

......Then add put a small bluetooth amp under the seat to play music from phone through that with no head unit needed at all.
(For example https://www.crutchfield.com/p_113M18....html?tp=83532 )

This is my plan as well. I did the primitive version of this pre-Bluetooth with a headphone to RCA adapter and my iPod (or a Walkman style FM) thru an amp. It worked great and I could still use the original AM if I wanted to.