Stock Mini GPS Video In?

[ABolewski]

With a bit of googling I found out that it's impossible to pick through all the aftermarket GPS installs. I was wondering if the stock mini GPS unit in my MS3 has the ability to add a video in? I'm assuming not, but do you think it would be easy to replace the screen with one that has two video inputs? Then a rear view camera could be routed to that screen. I'm not a fan of the screens in the mirror's or adding a second screen. What do you all think? Pretty sure this is going to be a project when I get back to my car in California.
Just an FYI, I want a back up camera because I have 5% tint. A pain in the ass to back up some times at night.
Side question, do you think the reverse lights are bright enough to get a decent picture at night with a normal camera or does any one recommend the back up cameras with little LED's around them? I have no experience with back up cameras.
-Alex