If all you're looking for is the ergo setup, simply use 10 speed veloce ergo shifters. First, make sure your rear hub can accommodate an 8 speed cassette. If so, find an 8 speed shimano cassette. The campy 10 speed ergo shifters will pull the exact length of cable needed to make a shimano rear derailleur shift across an 8 speed cassette properly. You'll get you quick shifting and comfy ergos with fresh cables with not many other changes needed.