I'm going to show my ignorance here. Despite searches, I can't find much info. Did anyone ever make an adapter to hang a Campagnolo rear derailleur on a Simplex non-threaded dropout? Without Drewing the dropout? Not possible? Not a good idea? Not worth the effort?

BTW, I'm not opposed to a bolt-on claw type hanger but note that the Campy top pivot bolt projects out the back of the hanger, thus interfering with the Simplex dropout hanger.