Won't the wingnut be blocked by the derailleur?
From the days when my AO-8 still had wingnuts, the one on the derailleur side was different than the others in that the wings were arc'ed higher to clear the RD. Of course the AO-8 used the claw.
[Flame suit on]: you can make this work by sawing off the hanger and just using the claw!! Its called Drewing and seems very popular amongst a sub culture of the biking community [Flame suit off] [and I really was just kidding! Get a different derailleur]
I also think that if you are handy (or have a friendly machinist near to hand) you could adapt the original pivot bolt and fabricate a tabbed washer. I'd probably cut off the threaded portion and drill/tap a hole in the remainder of the pivot bolt to sort of replicate the mounting system that @
verktyg shows in the catalog page.