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Not really because there isn't enough space for a drill and dont think theres much more meat on the bridge for a larger hole. Also the washers would need to be drilled out more too and I cba.
Its ended up like this -
How necessary are brake adjusters? got given the brakes, one adjuster was lost in transit and the other just didn't come with one.
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Best for fine tuning rather than using an allen key. Cheap generic adjusters - https://www.ebay.co.uk/itm/PAIR-M6-6mm-Brake-Cable-Barrel-Adjuster-Bolt-Screw-Nut-Cycle-Adjusters/300966718240?epid=1488243029&hash=item461303ab20:g:MOcAAOSwUlFaqWHm
Not sure if I understand but could you not use a longer recessed bolt?