Campy triple?

I'm thinking about adding a ring to my Campy equipped Trek 2200. !994 8 speed Veloce with a double chain ring and an extra click in the front shifter. Makes me think it could be a 2 or 3 ring shifter? The question is what triple will fit this bike? I see there is a Veloce 9 speed triple or maybe one of the Racing T crank sets with an even lower small ring. Do either of these fit without changing the bottom bracket? As I get older even the hills in Iowa seem to be getting taller. Is this something that could be a direct swap out, or am I looking at a whole new drive train?