Was the fork supplied that short or did you cut it yourself? I've seen fairly thin canti hangers, so you might be able to squeeze one in with a different stem that takes up less space. Perhaps a single bolt stem so it can be run a bit higher?
For example http://www.sjscycles.co.uk/product-Raleigh-Alloy-Front-brake-hanger-28.6mm-bore-with-locating-tab--Black-6765.htm with the locating tab filed off
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Was the fork supplied that short or did you cut it yourself? I've seen fairly thin canti hangers, so you might be able to squeeze one in with a different stem that takes up less space. Perhaps a single bolt stem so it can be run a bit higher?
For example http://www.sjscycles.co.uk/product-Raleigh-Alloy-Front-brake-hanger-28.6mm-bore-with-locating-tab--Black-6765.htm with the locating tab filed off