I did some more testing. The problem is so strange that the cause wasn’t entirely clear at first.
Vorpx works fine until i use my keyboard. Head movement is translated into ingame view movement, and i can use my mouse to activate any ingame vorpx function (whether it’s the vorpx menu, edge peek, or anything else) that i bind there.
It wasn’t correct to say before that edge peek was the only hotkey that worked, it’s just that it was the only hotkey bound to a mouse button and not a keyboard button by default.
As soon as i press any button on my keyboard–any button at all–head movement stops working and vorpx hotkeys assigned to my mouse also stop working.
All of my keyboard presses are sent through and handled by the game normally.