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Will an external BB not be the ideal solution? See https://www.bikemonger.co.uk/yst-threadless-bottom-bracket-58-p.asp?_=&variantid=60
I have one of these on my old Carlton steel frame, works fine. Mavic used to do something similar, I had one on my Vitus 992 many years ago.
You've fucked the threads, which will need chasing/recutting if there's enough material left. A shop shouldn't charge a lot for that, definitely less than the cost of the frame, but they could tell you quite quickly if it's possible
If not, you'll need to look at another BB solution, press fit maybe