I guess nothing is truly impossible but that request is so weird it is almost surreal in concept. Does your client mean can you project a digital image on a screen, then obviously yes or does he/she mean can print an image on a small piece of transparent film and put it in a plastic/cardboard mount. If it is the latter then good night mother, the martians have landed.
The easiest way i can think off would be to print the photo the size of a 35mm frame onto a piece of acetate and mount that in a slide mount.
You’d probably have to play around with the settings on the printer though as the presets for printing aceate would probably be optimised for overhead projectors.