A year ago I made the switch you are talking about. I was running a Campy Ultra Torque Chorus crankset with 50/39 chainrings. I was able to get a Campy Ultra Torque Chorus compact crankset (50/34). It was a 2014 model I believe so it still had the 5 bolt rings (with the goofy offset). Since I already had the outboard bearing cups I didn't have to purchase anything except the crankset. Not wanting the 50 I was able to get a 46T Campy CX chainring. Bolted it all on, lowered the front derailleur slightly and it works like a charm. No other adjustments required. Good luck.