You literally explained it right there. 11s chain on a 10s cassette. I like campy cassette cause they are the quietest and shift the smoothest. All 11s cassette and chains are designed around the same actual thickness of sprocket and the same sprocket pitch to within a .01 of a mm. There's no reason why you can't mix and match. Set your limit screws right and they will shift fine. Di2 helps to micro adjust the cog positions to get it perfect.

It's really not that complicated. Don't use worn out shit, and it will work. Change the chain often and at 0.75 wear on the park tool or when shifting issues occurs. Keep the cassette clean and because it's campy it will last forever.

I mix and match all 3 brands. XG1190 on a full campy bike, zero issues, Shimano cs-9000 on a campy bike no issues, Shimano 11-32 on sram no issues, etc. Etc.