While I'm no expert, I recently upgraded my 2011 F-150 Raptor electronics and used the idatalink maestro module (models: rr and rr2) to obtain flawless integration to the existing vehicle controls.
Maybe start with the idatalink maestro compatible radios/screens and see what is available.
Very bad situation where everyone involved suffers, abet some much more than others, very sorry for both your friend and the family of the young girl, both of which whose lives will never be the same.
I too have lost good friends either while they were participating in illegal street racing...