Originally Posted by Andy_K

St. Sheldon confirms your observation that Campy 8-speed had 5.0mm spacing, so I think that should work just fine. I've been experimenting with various off-spec combinations over the past year and my observation matches the theory -- namely that as long as you get the spacing and the derailleur movement properly matched, no matter how you do that, things work pretty well.

There is a slight caveat that $60 ergo shifters on eBay may need to be rebuilt. The good news is that they can be rebuilt to work like new. I think it's worth the risk.