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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.
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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).
Any chemical that could potentially reduce the adhering epoxy will first attack any other epoxy it can find, i.e., the topcoat of the carbon fibre frame,
but you have already worked that out.
As physical force has failed,
the last option is the cutting one.
Depending upon the bond strength you may need 4 or 5 cuts.