AFAIK the only thing you need to look out for is Dyna-Sys because of the different cable pull, whether that's clutch or not wouldn't really matter, I think. 11S only works with Di2 combo's
That's right. Clutch mechs only came in with 10 speed. With Shimano, 10 and 11 speed MTB aren't compatible with road shifters. There might be a jtek converter that would help. Or use friction bar end shifters!
Avoid all dyna-sys mechs, 9 speed RD works with 10 speed casettes and shifters