Thanks a lot, to all 3 of you, it worked!
I left the “logitech gaming software” fix as a backup (as I dont want to have to turn it on every time, or revert the fix when I want to play DCS/TKOH/WarThunder)
Decided to edit the .key file with a notepad++.
Added
SimDoNothing 0 -1 -3 1 0x0 0
SimDoNothing 0 -1 -3 3 0x0 0
SimDoNothing 0 -1 -3 5 0x0 0
SimDoNothing 0 -1 -3 7 0x0 0
```to the bottom of the .key file, and it actually worked!
Problem solved!
(if anyone in the future has this problem, just add above code to your saved controls in a .key file inside user/config/ folder in your BMS installation, cheers!)