Please don't take offense to this but being the original owner of a 2012 Edge Sport with the 8" screen and navigation, I cannot understand why someone would consider doing this. Had I known how poor and unreliable the telematics on this car was going to be, I would have saved the THOUSANDS of dollars by going with a lower trim level and slapping a smartphone onto a quality mount and calling it a day. I've already replaced my backup camera, had an SD Card failure, and now the car's APIM is probably on the road to total failure.
Oh, by the way, the price for a new backup camera went up over 200% since I replaced mine over the summer.