Still trying to figure out how to remove the derailleur from the hanger. What I tried yesterday was tapping out a thread, inserting a bolt with red loctite, and trying to unthread both once the loctite cured. Unfortunately, the silver but just unthreaded from the derailleur bolt. I’m trying again with more loctite and liberal usage of WD-40 around, but I’m not optimistic about attempt #2.
From what I understand, my next and probably last option is to drill all the way through the bolt, trying to maintain the threads on the hanger but buying a new one if necessary. Does anyone have another idea before I try the nuclear option?