I think SJS do threadless bottom brackets for frames with damaged threads like this for about £25 - looks like the cranks are square taper so should be fine.
I should mention I've currently got one of these in so that will come with it too. I've never managed to get it to lock tight enough but someone else may have more luck with it than me
I think SJS do threadless bottom brackets for frames with damaged threads like this for about £25 - looks like the cranks are square taper so should be fine.
[https://www.sjscycles.co.uk/search/?term=threadless%20bottom%20bracket]