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There's been numerous occasions fixing things where I needed to make/alter my own tools. Almost always has to do with access or clearance. In this case, what about buying the right size offset box wrench, and cut the rim off slightly as needed:
Wrench.jpg
All this tool needs to do is function as a breaker bar, you can spin it out the rest of the way with something else. If you need more leverage, slide a pipe over it.