Thread: More advice
Matrix mixer is definitely a good one - if you don't mind investing in some right angle cables, the NLC Clump also has VCAs built in to make things extra-interesting. Spring reverb (like from Befaco or Music Thing) would also be a good call. Speaking of Befaco, a Rampage wouldn't be a bad idea. It's kind of like their riff on the Serge slope generator, and it'd probably be a big help in here.
I always liked the idea of the Black Noise Cosmos, but that's a bit niche. It's worth a look, though.