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Sorry, this is @adamdenw
You can buy the convertor bolt (and anything else you need from Spa Cycles to make the most of the postage cost).
https://spacycles.co.uk/m7b17s100p2341/SPA-CYCLES-Allen-Key-to-Nut-fit-Converter-Bolt
If it needs a nut-fitting brake front and rear then the rear allen-sleeve-bolt brake with the really short bolt gets converted and goes on the front and the old front brake goes on the rear.
Thanks. Seems a fork swap is necessary.