I had looked into that, looking at a few options, to swap over drop bars for flats but no real options of brifters to work with Campy. The bike has a Xenon rear derailleur but will have to check the hub and cassette. I have Shimano cassettes/brifters already.
I would guess that Shimano spacers would be used, maybe need fettling to fit the freehub ? I see that Shimano Campy sprockets are different thickness too but not by much. I'll get more details.