'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
The spider on a double doesn't have any mounting points required to mount a small (74 mm BCD) granny ring so you will, at a minimum, need a new crank and bottom bracket. You will probably also need a new front derailleur but that's not certain. Your double rear derailleur will work if you avoid the smallest two or three rear cogs while using the granny ring. You are fortunate that Campy Ergo shifters are double/triple compatible.
can i switch out the rings only for a compact set?
No. Your Record spider has a 135 BCD Bolt Circle Diameter. The smallest chainring that will fit is a 39t. The compacts are built with smaller BCD's.
Don't know which cassette you have but you can run a 13-29.