Yep, that's an excellent choice! Not only does that give you VCA audio level control, you also get the panning under CV and CV on your AUX send as well. With that 2hp Verb, that's perfect...just patch the AUX send on the Toppobrillo to the Verb's Left input, and you get one-point stereo out. Patch that to your AUX returns, and you've got full CV over the reverb! Note also that the CUE send can work here, too...for example, patch that to the frequency shifter, and return that via a strip on the mixer, and you can drop signals in a similar manual AUX path from your cue sends. Just be careful to NOT activate the cue on that one strip for the frequency shifter, or bad feedback happens (unless you think that might be fun! as in...cue out to delay, delay to frequency shifter, FS to strip one with cue on, and manually control the feedback of that loop to get stairstepping pitch-shifted echoes of your other thru-cue signals! nuts!).
The other changes are primo, too! I see you went with the VCA control over the Quad VCO trick...that'll be loads of fun. Plus the VCSs. Yeah, this is shaping up to be a killer rig...