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@jsabine
There's a couple of threads on YACF about this very problem ... https://yacf.co.uk/forum/index.php?topic=80656 and https://yacf.co.uk/forum/index.php?topic=80928. They drift a bit, but a good few ideas.
I reckon that your easiest and cheapest bodge is to create an extender out of something like an offcut of plumbing copper - might want a couple of thicknesses to keep it stiff enough, but should be able to get close enough to the curvature of the braze-on. Drill a couple of holes, bolt one end to the existing braze-on and the mech to the other.
If that would put the mech too low, then file the braze-on to extend the slot downwards. I reckon you'd defintely be OK if there was 2 or 3mm of metal left at the bottom, and might be fine with less.