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Hmm I’ve never been able to get the 2 bolts tightened together technique to work before. I’m going to have to see if I can get access to box aren’t I.
I might have some spare bosses somewhere too so I might have to cut the boss without damaging the brake, but that sounds like a pain in the arse too.
Only thing that I can think to do is to thread 2 or more nuts onto the brake boss threads and then tighten them together with high torque. Then grip this pair of nuts with a spanner and try to undo to the brake caliper bolt.
...or grip the brake boss bolt in an axle vice with soft jaws or an inner tube as protection.