Intriguing! If it works, it might be an option for a cottage industry dry plate company. I can very much see (or at least hope) that that kind of new-to-us small company will ascend again. Some of the new technologies, like 3D printing, might be about to change a lot of our concepts about manufacturing. Back to the future, anyone?
In the meantime...
don't overlook that a couple of bucks for some glass, a silicone baking sheet and a catheter syringe will get you perfect plates.