Yeah, I contacted him as well, but he hasn't gotten back to me. Been several weeks since he's been on BENOS, I hope things are good with him.
The factory CZ comp (and Venry's) is about the only one that I've seen used, though the factory one is apparently really hard to get ahold of. Assuming you could get an extended barrel threaded to match, I don't see why any 2011 comp wouldn't work, though it would likely look goofy.
I have a copy of SolidWorks that I'm playing around with, trying to model up some ideas I have. I think I have a decent understanding of how the comp/barrel system would work out, but I'm working on a recoil spring/guide setup. Someone else tipped me off to the factory EAA parts that Hennig sells at his store, and I'm thinking about picking up the guide rod/reverse plug/spring setup to check it out. I haven't done much prototyping (especially in SolidWorks), but am trying to get the hang of things. I think a cone comp/reverse plug setup would/could work, I just need to get something together that I can have machined up for me.