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How much facing does it require?
If it’s just to skim paint off then a fine file laid across the shell should suffice.
If you need to remove metal then you’ll be wanting something to ensure your square to the threads.
It should be too difficult to make a set of guides to go with the Park Tool BFS1 if the facing cutter on it is a large enough diameter? I think it’s the same cutter that gets used for the headtube facers and there’s a larger version of it that might be something more places have?
Getting the thread cut on the guides would be the hardest part. Maybe they could be 3d printed if it’s a high enough resolution print? Failing that, a bit of aluminium turned down to be a snug fit inside the threads might be enough?
M_V
Any decent bodges to face a T47 bb? No one seems to have the tools for it here. Attack it with a file? It's campag pro torque or whatever the new bb is called, and the crank doesn't spin freely because the shell is slightly too wide.