Doepfer A-185, Vmpe T43, NE Quantas Pax all can do the job. With only 2 voices smaller is probably better, but Odessa w/ expander could be very useful. Switches are inherently more performable but if you can CV transpositions that can also do the trick.
Martix mixers: Tesseract 8x8 could be nice. The WMD matrix is also super cool especially since you can sequence the stages. Other mixers get a little big for this size. I got a cheap passive on in a trade and that honestly does the job too. With a little muscle memory you'll be able to basically turn on and off modulation to set destinations or combinations of destinations.