what size frame is it? I find that makes a difference. If it is larger I think you can run a right hand cable fixing front caliper without too much bend. Run the cable on the back of the bars for a bit more height and it will swoop out to the left side a bit and back down to the caliper. It should be fine. I wouldn't not use campy record brakes on an all campy record build just to get a nicer arc of the cable, but that is just me. Make it work.