Someone should just photograph his work, repackage it, and sell it. He would be totally okay with that. Use something like Office Lens on your smartphone to do your image transformation and print them on canvas.
So far, none of the women Prince stole images from have sued him -- but one of them, a user by the name of “Missy Suicide”, has done something even better: she’s begun selling (wait for it) photos of Prince’s photo of her original photo. While Prince’s version sold for $90,000, she offers hers for a mere $90; all proceeds have been donated to the Electronic Frontier Foundation, a nonprofit that fights to preserve digital content rights.