Hmmm... I'm not much of a generative musician, but I think I would probably want some switching, random, and logic options like the Doepfer A151 and MI Branches, maybe the Joranalogue Compare 2, and I know a lot of folks love MI's Marbles for generative. Disting would probably cover some of that territory for you. It's not much fun to use though. I've been eyeing the Qu-Bit Synapse as a fully-featured crossfading switch but at 20hp it's a lot of real estate (and $) to sacrifice. I personally like the Warm Star Electronics The Bends for a small (10hp) CV controlled crossfading matrix mixer. Might be worth a look?
Your signal flow looks pretty logical, so if it works for you, I would keep it as-is.
Have fun and good luck!