Do you have an old camera and speedlight? you might try opening the back of the camera, setting the shutter to B or T (just something that allows you to keep the shutter open indefinitely) and placing the speedlight on the film plane. Then you can focus the light. You might have to defocus the lens a bit, or you might pick up the grid pattern on the flash. You might also try pulling the flash back a bit from the film plane, and covering the back in a heavy cloth. You'll need some kind of remote trigger for the flash, of course.
I haven't done this exact same thing, but I have done something similar to project the image of a slide using this same basic technique, only with a piece of slide film inserted between the camera and flash. I know the OP has probably moved on from this, but someone else might find this useful in the future.