I have taken that license plate camera and busted it open... opening is very simple, unscrew two screws that "hold" the back to the front, and then took a thin blade and cut the adhesive along the joint lines and then the back came open.

As you can from the pictures, the front part of the assembly, where the camera is at, is rather flat, and should be able to fit where the cover lens was. Next thing will be to figure out how to secure the front to the opening of the license plate light, as the back part, that is too "fat" has the snap-ons that otherwise would have held...

I am still working on this...

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