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The bolt is currently tightened into the crank by about 40nm, to confirm it won't take that much to unscrew it?
It might take about that to start it, but once it moves the torque drops to about nothing since it's no longer loaded. In unscrewing, you're only loading the flanks of the hex, not the flange which broke off, so there's no problem there.
gbj_tester
The bolt is currently tightened into the crank by about 40nm, to confirm it won't take that much to unscrew it? I suppose it's already done the job of screwing the crank together...
I'm worried that I'll shear it by trying to unscrew it.
I think it was my fault. The extractor cap wouldn't sit flush, despite being installed the same way it was taken apart. There's a small washer between the bolt and cap, which has always been in there and is preventing the cap from sitting flush.