After months of searching and asking people how the hell they got their HOTAS working in Squad, I finally made it work.
Since there's no video explaning this, I decided to record it myself.
It's my first ever and probably my last, so exuse me for this amaturistic recording ;)
Applications needed:
Vjoy:
https://sourceforge.net/projects/vjoystick/
Joystick Gremlin:
https://whitemagic.github.io/JoystickGremlin/
HidHide:
https://github.com/ViGEm/HidHide/releases