I have seen the bosses hacked off and a cable stop clip fitted adjacent- so sad. This was a frame from the late 1950's, when braze ons were uncommon!
I have seen where Campagnolo shift levers ( the earlier ones with the backing plates- reconfigured, here the hacksaw and file was taken to the levers then assembled and the cables run through the backing plate as a cable housing stop. At least period correct parts used