Got hit by a car a couple of months ago, they took off, left me with a broken SRAM shifter. Campy 11 speed Potenza shifters were cheap because of brexit, so I picked up them and a matching rd with a cheaper campy cassette. No matter what the campy rd rubbed the chain, so annoying.
So I got high one night and looked at the specs of pull ratios/cog pitch on here: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/
Ended up figuring out you can mate the Potenza shifters with an 11-speed Shimano rd, and a Shimano/SRAM cassette with two 10 speed spacers near the center of the cassette. It rides just as well as my bike with complete Ultegra.
Does anyone else mix and match? When I used to manage a shop people would come in with some jank setups. Prices have been crazy and people are desperate, kinda thinking stuff like this is going to be more commonplace. Pleasently surprized it works so well.
I have, for years, been mixing Campagnolo components of all kinds. My main "gravel" bike is Campy Record 11 with a 9-speed carbon Centaur long cage rear derailleur, which I modified to increase to spring tension to keep chainslap down. I use Shimano hubs with an Ultegra 11-speed chain and 11-34 cassette. Crankset is a Sugino OX 46/30 mated to a Shimano Dura Ace bottom bracket (both are 24mm spindles), shifted with a Shimano CX-70 10-speed "cyclocross" front derailleur (works better on the smaller chainring setup). This is a flawless setup, to be honest, because the pre-2015 Campagnolo is backwards compatible with nearly everything since prior to the advent of indexed shifting, and the front shifter is the ratcheting variety. When you get post-2015, things get a little more complicated, but fortunately the old 11 speed stuff is dirt cheap.
My road bike is Campagnolo 10-Speed Chorus mated to a Shimano 8-speed rear derailleur and 11-32 8 speed cassette, with the top two clicks limited out with my RD. I found an old IRD 10-speed Campagnolo-compatible "Shimano" cassette in my parts bin, so eventually I'll swap to a real Campagnolo derailleur and this cassette, but right now the tires are flat from never riding it, so I don't see why I would bother.