I think I'll not be able to get much force on the cup using a pin spanner. Much less than the BB tool anyway. Maybe if it's really soaked in penetrating oil, for days, it could work.
Though I could maybe fashion a beefy pin spanner of sorts by standing two strong rods in a vice and drilling two matching holes in the cup.
Yeah, or make a tool with two 10.9 high tensile short m6 bolts through a bit of flatbar. Something like this - might even be able to use an angle grinder one if the pin pitch fits.
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