I think about this kind of crap all the time. I’ve been thinking also about a rotating wasteboard (I can’t imagine an application for that, but that doesn’t stop me from thinking about it)
Here’s an application: Recall the discussion several months ago about curved tags ( Engraving text on to brass? )? A curved wasteboard and rotary setup would make that a snap, as there would no longer be the need to match curvature in generating the G-code.