Film photography is my hobby and I think that there isn't anything that would prevent from exposing a displayed image on a piece of film, except for the cost.
Depending on film it might not be easy to tell exposing an image from a real picture.
The "hybrid" digital instax cameras work this way, it's just a digital camera that has a way to internally expose the picture on the instant film.
It's trivial to do analog prints from digital images too, just requires an inkjet printer and a special film to print out the "digital negative".
The only way in which it may succeed as a deterrent is that it actually costs some money (film and processing is not cheap) and requires actual work to do those extra steps.
It's easy, just more to Signal