Control! You must learn control!

I'm interested in how you all would approach this "small rack challenge".

The Problem
The main voice in my small rack is the BIA which, as everyone knows, benefits from a lot of modulation. I also want to add an Entity Percussion Synth which, needs even more modulation than the BIA. So far I have been using Pamela's New Workout as my primary sequencer and modulation source, sometimes supplemented by a Moog DFAM. This works but it's not very playable -- it's quite fiddly and it takes long time to put together a decent bank of patterns to make a tune. Also, Pam won't have enough channels once the Entity shows up.

Solution?
Get one of those 64hp Pod cases (or alternatively an Intellijel palette (4u x 62hp)) and fill it it with control devices. Like so :

Constraints
I already have the Tetrapad (but not the Tete) so that has to go there. Pam and Pexp-1 don't have to be there, but getting them out the other rack seems more logical and makes more space for monsters like the Entity.

I cannot get a bigger rack until I get a bigger house; also that misses the point of the challenge!

I'm making techno, but feel free to approach from your own musical direction.

How would you do it?

Forgot to say : here is the rack this one will be controlling.

Malekko Voltage Block and PNW would be my choice for this challenge.

Hi Farkas,
I did think about the Voltage Block, but I thought -- perhaps wrongly -- that Tetrapad + Tete could cover most of what it can do, and leaves some space for other things (like a trigger sequencer.) But yeah, it's a good choice.