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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.
Brommers-
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
I guess caustic soda isn't going to be too nice to the crabonz...
I can't imagine you are going to end up with a great surface on which the new BB is going to press in to if you cut it out?
If it's not dead, I'd be looking for a 24mm crank and cursing the guy who thought gluing it in was a good idea