Sorry that was just a suggestion.I think I have even heard of people brazing on mounts for v brakes.You might wish to check Rivendell for brakes with longer reach also explore taking them off a thrift store bike if you find ones with suitable reach . I have brakes coming out of my ears but have not measured the reach.Another option would be to lower the brake bridge with an extension. This is simply a metal plate with two holes drilled in it attach one side to the current brake bridge and then attach the brake to the other end.