Is it safe to put the front light mount designed for the fork (as pictured below) on the road brake pivot bolt?
I know I'd need a longer recessed nut. What makes me worry is that the steel wire loop of the mount is not flat.
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I believe it is safe, as the brake's actuation isn't predicated on a flush mounting surface. The problems you are likely to run into are:
Finding a longer recessed nut. They only make those in a couple sizes, and you really should have them threaded on quite a bit to be sure they are secure. You're screwing with your ability to stop here, after all.
Moving the brake ~2mm forward may change the brake pad position relative to the rim. Just a tiny bit, but it may be enough if you were already at the edge of the brake's ability to reach the rim.
If both of those seem OK and secure, I'd say go for it.