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How about either ....
Countersinking the hole in the rearsets and using a matching bolt (or perhaps counterboring).
Or, using longer bolts to mount the master cylinder and fixing a different bracket (back to ally plate) off their protruding ends.
Personally I think I'd favour the latter as it gives a more positive mounting at the frame end.
In a purely structural sense, the best method might be another bracket welded on the frame, but lower down. But it wouldn't look quite as clean.
Finally, and following on from Albie's comment, I hope you don't find my suggestions intrusive .. just trying to be helpful.
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