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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.
mespilus-
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.
Brommers
I'm working on the assumption that once I get it out I'll need to Loctite the new bearing cups into place, and possibly use a thread-together BB. I thought about just getting a 24mm crank, while the 24mm BB is still reusable, but I've got two Rotor 3D+ cranksets with P2M power meters on them, and I can't really justify getting another P2M crankset. I have, ahem, enough already.
Caustic soda isn't an option I'd really want to adopt - fine for a steel frame, but pouring caustic into a carbon frame seems a bit risky.