Ah, now that's interesting ;)

So i would modify the drawing to make the outer edge of the two parts into a single path, then connect the inner edge of both parts into another solid path that overlaps the first path at each end, then as you say, run the small holes and the outer path to finish state and full depth, remove junk frame, add clamps to each part and run middle path to finish.

I'm liking that, thanks. It means adding another two tool changes but thats not really relevant if it ensures the parts come off in top quality AND without any onion-skin to clean up.

Nice.