So according to this Velonews article here, the pull ratios between campagnolo and sram (shimano) 10s are pretty much negligible for all intents and purposes, right?

I just want to make sure-- I'm building a cross bike and picked up a pair of 10s chorus shifters for really really cheap, but I have shimano everything else. I'm thinking of running the shifters with a shimano 10s wheel with a 9s XT rear deraileur... that should work, right?

it sounds like sram and campy 10s use a close-enough similar amount of cable pull per shift. However, this pull is very different from shimano. You'll need a shiftmate or similar to do what you're talking about.

However, from the sound of things, you could get away with a SRAM RD (they make apex and I think rival in a mid cage for larger cassettes.)

Use a Jtek Shiftmate to adjust the cable pull: https://jtekengineering.com/shiftmate.htm

They have several models depending what components you are mixing, sounds like you need the #3