1987 FC - Low Cost Audio System Upgrade?
 

Goal is to replace the audio system of a 1987 FC Turbo with either:

1: Touchscreen Unit that possesses bluetooth capability and/or apple car play to pair my iPhone with
or
2: Wireless bluetooth speaker system and just throw it in the trunk of the car but wire it using the car's battery
or
3. Open to suggestions

Wondering what your experience is like modernizing the interior - improving the sound system - for a budget around 150$
Would love to hear all of your stories & approaches on what you think is best!

Example for 1:
Example for 2: