Hi @KAM welcome to the forum!
I am not personally aware of many standalone devices that can convert MIDI to CV with that specific range, however maybe another user has better experience to share. There would definitely be a lot of options in the Eurorack world, if you ever consider getting a small powered case you could mount Hypno and the MIDI interface in there together to keep things compact.
Currently there isn’t any way to send MIDI from a computer to the Hypno directly over a USB cable, however, there are a few other options you might find useful.
For one, if you’ve already got a physical MIDI interface, you could add something like an iConnectivity Mio1 to bridge the MIDI gap between Hypno and your computer, and avoid converting to CV altogether. Admittedly it’s a slightly hacky way of doing things but it would be pretty cheap, and allow you to control all of Hypno’s parameters instead of just the CV inputs. I’ve done this before using a simple 2x2 MIDI interface and the Mio1.
If you’re intent on using CV, then some audio interfaces can serve this function. There are a handful of interfaces made specifically for Eurorack that would allow you to send CV from VCV, though I’ve never used one of these personally.
Keep in mind that a 0-5V signal will still work with Hypno, it just won’t reach the full range of that input. 0-5 is very usable range, however, and often I find myself scaling voltages to even less than this for subtle modulation. The control knob for this parameter acts as an offset too, allowing you to further dial in the modulation.