Sounds like you could use an attenuverter between the SQ-1 and Hypno to turn the 5v into +5v/-5v so if you go the eurorack way this is one answer.
I’m working on a fully midi solution.
I’ve ordered a Midihub from Blokas which will serve to either pass thru midi from my midi controller (arturia minilab mk2) & laptop straight to the Hypno or manipulate it further, by putting an LFO to a CC value for example.
I also got a cheap usb midi host and usb to midi cable so I can connect various usb things into this system.
Once it arrives I’m going to see how well it plays with VCV. I hadn’t even thought about linking VCV and Hypno, now I’m super excited.
On the webcam and capture card point: neither of my cheap devices work either. I’m going to do further testing because I really want to play with this feature.