This may not be possible at the present moment where you are(because COVID-19), but this is definitely the time to bring it to a shop. They can try to chase the threads, and the tool just isn't economically sensible for a home mechanic to own. If they can't chase the threads to make them usable I would not recommend any hackneyed solution to try to use a threaded BB. Threadless BB or frame in the trash are the advisable options in that case.