You will get a very soft image. Even the thickness of a thick film or transparency is enough to make the image look like it was out of focus. I printed a digital image to a transparency to print in cyanotype and Pt/Pd. I accidentally got it upside down so the ink was not in contact with the paper. The result was interesting, but not at all what I was going for. Your idea was the first thing I thought of after seeing the Enjofer, but I quickly realized it wouldn't work and started thinking about how I could mount my phone in my Omega D2 so I can actually focus the image.