I did this to my front brake. A Shimano Dura Ace. I got tired of the cable getting damaged by the bolt and had this idea. It's made out of Ti. There is a small collet inside the the bolt squeezes. There are alot of hours into this. I thought some of you would like to see it. I can get more pics of the insides.

here's another one

Doesn't look like a bad idea except it doesn't look very adjustable. And how hard is it to release the calipers to remove the wheels?

Since the shifters are Campy they open up at the shifters.