Retrofit of Back Up Camera on Base M2?

Its hard to believe that the back up camera is not standard on all M2s. Has anyone looked into doing a retrofit? For $110 I bought an aftermarket retrofit camera and wiring harness for my 2016 Miata. Installation was $85 at a car stereo store although I could have done it myself but I don't like working on and under the dash board. It was a plug and play install except drilling a hole in the back bumper for the camera. The kit even included the correct size hole saw.

My other two vehicles both have the cameras and I miss its extra eye on the rear especially in parking lots.