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@mustard
Back to the Twenty.
Time for the bottom bracket surgery
I couldn't shift the cups so started trimming the shell with them still in to give me more purchase.
Success! Took the kickstand off too, I don't want to hack off the mounting or the chainguard supports until I have cranks fitted. Ideally I want to refit them if I can get away with it.
Trimmed the shell roughly with a hacksaw then tried chasing the threads to BSA so I could thread in the facing tool but I pushed the tap a turn too far and tore out the threads completely. Contemplated taking it out to ITA but it's too much hassle so I'll get a threadless BB.
Managed to face it down to about 69mm and pretty square so hopefully that'll be close enough.
Now it's looking like this: