Hi Kate

That is called printing on positive film. Many shops do this for cheap. It is almost like a slide (which is colored and can be enlarged and projected).
They use this to make signs on building now-adays with a neon behind it, The light projects through it and the image looks like it was lit up from a forward shoot when in reality, it is done via back-lighting.

That should take care of what you want to do as far as projecting and avoiding to draw the image and and and, getting a perfect result with what I am suggesting. I did it. So, at least, I know what you are relating to.

Edit...this is the same technique as ouputing films for a press except that, the 4 films are outputted on one film only.