>would it be legal to reverse engineer (intentionally simple) prompts for each piece of art needed, and then commission either humans or GenAI to create these, to then be able to distribute the remake without any dependency on the original?
Sounds like clean room design. If you can prove the art was independently created, and you weren't just abusing the process to launder the original works (eg. prompting the AI a bazillion times until it looked exactly the same as the original), then you'd probably be fine.