I'm from Switzerland, Zurich
I have seen a video in a German Mustang forum from a user that installed such a solution and sold it. Unfortunately that was back in 2006 or so and in between he left back to US.
I know it must be solved via the camera entry connection.
Looking at the Lockpick solution to connect a backup camera to the SYNC (picture below) I just need somehow to connect the iphone to the dual camera input wiring harness.