If you have the patience... Get a responsible younger family member (or neighbor kid, grandkid, etc.) and use this as a learning experience... and pay them well.
If you know how to do it (I figured it out from YouTube videos), you supervise and instruct... they do the work .
In the process you've accomplished two things: You got a project accomplished, and the kid learned something AND made a few bucks! A win-win.
P.S. As far as head units, any double DIN with video in/out will work.