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With any luck the volume of epoxy will be minimal,
so if you do the first two cuts to allow a wedge of the bb to be popped out,
whilst the adhering epoxy is still warm from the friction of the cutting tool on the metal.
(I once had to cut through the heads of seized bolts holding an Espace diesel fuel tank in place. I had to use the angle grinder intermittently, as the friction heat was causing some cheap+ manky, probably bitumen-based, anti-corrosion coating on the brackets to bubble).
mespilus-
I've cut two slots at 180 degrees in the bottom bracket cup. The good news is that the cup is now turning in the bottom bracket shell, so whatever adhesive has been used has given up. The bad news is that the cup still won't come out, even with some more BF&I. Fingers crossed that two more cuts tonight will do the trick.
Brommers
Yes, I'd already decided that just dunking everything in MEKK in the hope of softening the epoxy would be a bad idea. My plan at the moment is the section the BB cup into quarters and try and peel it off, relying on the hopefully limited peel strength of the epoxy. If it buggers up the BB shell then I can always get it repaired once the cup's finally out of the way. Or just bodge it again.