Indeed, I've switched over to model similar to this in the course I teach. Weekly optional problem set + in-class quiz every week with one homework problem verbatim + an extension. The homeworks are completely open resource, LLM, friend, sorcery, w/e. I figure that, even if they're given an oracle, they have to internalize the ideas to the point where they can generalize on the follow-up. I'll only really know when the course finishes, but I think this will work out. I want to pair this with an oral midterm and final, but that'll have to wait a semester.