I read the original post and I'm going to come at this from the angle that your current workflow isn't going to change but you just want more options. So I'd recommend adding three modules:
Noise Engineering Mimetic Digitalis
My thought is to add a Mimetic Digitalis from Noise Engineering. It's a four channel 16 step sequencer. You may or may not use it for pitch. But where it should shine for you might be four channels of stepped CV modulation of four different parameters in your set-up.
Intellijel Quad VCA
I'd also add a true VCA module (the Mix 3 doesn't have individual outputs). So something like an Intellijel Quad VCA would work. That way you can either attenuate the amount of CV coming from Mimetic OR use the Mimetic to modulate the amount of CV coming from another modulation source (like an envelope or LFO).
Blue Lantern CMOS Party (discontinued but still available on Amazon)
Finally a logic module. Any generic logic module should work that has at least OR and AND outputs. Being able to take two patterns of gates/triggers and derive a third pattern is always useful. There are other logic outputs that also might be interesting when comparing.
I think between these three modules you'd be able to add some dynamics to Plaits or Marbles timbres that would make for some good sample fodder.