My performance road bike is a 1982 Bianchi with the original downtube Campy friction levers and NR derailleurs, but a 7-speed SRAM freewheel and chain (no dropout spreading was required). My commuter is a 1960 Capo, also with its original Campy levers and an aftermarket 7-speed freewheel and SRAM chain.

Yes, one can shift fast with STI or Ergo, but no shift lever/cable system is lighter or more accurate than old-fashioned Campy downtube levers. If you really want barcons, try to find an old set of SunTour ratchet levers.