Years ago, in the video/filmmaking world, someone did this same thing with creating a mount (Arri PL) for super expensive motion picture camera lenses, and had them focus on a ground glass screen, and then created a mount so that cheap camcorders could be attached and you could videotape the images off the ground glass. I think they even created a spinning shutter so they could videotape at 24 fps. "And it was just like shooting film with an expensive motion picture camera!"
Was a stupid idea back then, seems like a stupid idea right now.
Best,
-Tim