If you are bending the hanger I would strongly suggest having a
derailleur hanger bolt screwed in. That keeps the threaded part of the
hanger all in one plane. (Ask me how I know). Have straightened some
that were bent pretty badly with good success back in my repair shop
days. Certainly a real framebuilder would be your best resource for a
professional repair.
Cheers from Hot Dallas, TX, USA, earth
Clyde "bent there, done that" Putman