Campagnolo 10 speed shifter with 11 speed derailleur compatibility

Had the joyous event of my Campag derailleur snapping off into my old steel frame. I now find myself in the position whereby I need a new derailleur but finding a Campag centaur 10 speed QS Med/triple mech derailleur isn't the easiest task in the world.

Any ideas if my Campag Centaur Carbon 10 speed QS shifters will work with a new Centaur (or other) 11 speed rear derailleur?

I have a Veloce 10 sp QS set up with a 2018/19 Potenza 11 sp rear derailleur. Works fine. I think the indexing changed in 2012 or something, so 10sp parts before and after then might not get along.

If I'm not mistaken, pull ratio changed in 2015. Pre-2015 11 speed rear derailleurs should work with pre-2015 10s shifters.

But even pre-2015 med/long cage derailleurs are rare or too expensive. You could try a roadlink, but you'll find the problem with chain capacity.

I'm not sure if "new" veloce 10sp derailleur works with 10s pre-2015 shifters. Anyone?

I'm running 10 speed Centaur carbon levers with an 11 speed Record rear derailleur without any issues. It's a short cage derailleur if that makes any difference.

I think I've read somewhere that the new 11 speed medium cage derailleur only works with the 11 speed Centaur levers, as I discounted getting one of those to allow me to use a larger cassette on another project.

Hope you get it sorted.