Is is possible - retrofitting a Porsche back up camera integrated to PCM3 on a 991 Cab?

I just got a 2014 991 Cab S but in spite of the many options I ordered I was not able to get a back up camera. With the small rear window sometimes it is a challenge to back up safely even with the front and real sensors. I am hoping that I can adapt a Panamera or Cayenne Back up camera to this car but I want it fully integrated with the PCM3 like in my Cayenne with back up grid and the front and read parking sensors. My dealer offered a third party product with no-back up grid for $1,500. I would assume you can buy the individual pieces but then I would figure out how to do the required programming of the PCM.

Before I call Champion, Brumos or Suncoast I thought to see if you guys have figured this out already. Why this is not an option on a 911? I guess sports car drives don't need one. Once you have the Porsche rear camera setup you will not be happy without one.. A cheap solution is to lower the top