VCAs? I see the Joranalogue VC mixer, but you don't have anything specifically for use with CV/modulation signals.
Lose the mults altogether. This build is too small to sacrifice 8 hp for something that could be accomplished in 0 hp with inline mults and/or stackcables. Plus, if you want more trigger capabilities, 8 hp happens to be the space needed for a Pamela's New Workout, and that would give you eight channels of activity that includes that...and quite a bit more.
I honestly don't see the point of the Cwejman dual VCF, either. Not that it's not an excellent piece...but it's expensiveAF and, these days, a little too simplistic. Intellijel's Morgasmatron, ADDAC's Dual Wasp, The Harvestman's Bionic Lester mkIII, SSF's Stereo Dipole...all are far more interesting dual filters; you might be able to get one for near-zilch by trading in the Cwejman. Or better still from a space standpoint, there's Rossum's Linnaeus, Doepfer's A-106-1 or DinSync's SARA VCF, all of which fit in the same space as the Cwejman (the Doepfer even saves 2 hp) and offer some very interesting takes on dual VCF architecture.
Wavefolding and mixing. Why not both? Look at Tiptop's Fold Processor, for starters; this also gives you an octave divider. Blind Monk's Harmonic Multiplier also provides a dual-input mixing solution. But the most over the top version of this could be Vintage Synth Lab's AWM-3...a three input wavefolding mixer. FYI, combining functions like this is a great way to free up space in a smaller build like this; you could employ this as an audio mixer post-VCOs to give you a single audio path beyond it...and then this cascades on down to allow for simpler filters, mixers, processing, etc...all of which can then go in as smaller modules, which then ups your patch complexity while potentially spending less money.