I've used one of these before and it worked fine https://www.sjscycles.co.uk/bottom-brackets/110-yst-threadless-68-mm-sealed-bearing-bottom-bracket-for-frames-with-damaged-threads/
thanks for the suggestion, this do not need any chamfer addedd to the frame or anything?
@paulbiche started
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I've used one of these before and it worked fine
https://www.sjscycles.co.uk/bottom-brackets/110-yst-threadless-68-mm-sealed-bearing-bottom-bracket-for-frames-with-damaged-threads/