I'm having my old bike repainted and am considering adding braze-ons. I'm adding two for water bottles, but I have questions on others: (1) Can old Campy down-tube shifters be converted from clamp-on to braze-on? (2) Can I get a braze-on front derailleur for a wide-range triple (24-40-54)? and (3) Any other braze-on suggestions? Thanks.