I am not sure of your BB size/threading, but I believe it is standard English threading and width, if so, it is easy, if you are not locked into Campy...

You can find vintage cranks with 110 mm BCD, and run a compact chain ring setup if you want. You would need to probably switch BB and crank, and lower and adjust your FD, but otherwise you should be fine. Some Sugino and other cranks from back in the day used the 110 mm BCD.

You can also switch to a modern BB/crank while retaining the rest of the drivetrain if you want as well. Stick with an 8 or 9 speed compact crank/BB to keep it affordable and compatible.

I personally think the right vintage crank would look best on the bike, while accomplishing what you want.

As others above have mentioned, there are triple crank options as well.