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@rive_gauche
A machine shop would be able to skim off the pitting, however:
any hardening or surface finish would be removed, whether this is critical to wear or not i don't know;
the profile or seating radius will be altered so different sized and different quantity of bearings may be required;
the adjustable cup may be required to screw in further so depth of threading inside bottom bracket shell will have to be adequate.
Is the inner surface of the cups also pitted?