Can't rebind vehicle controls to numpad

I rebind all controls to the numpad on my keybard (Instead of WASD I use 8792 on numpad). Same as I do for all games including previous Borderlands games. However in BL3, I’m able to remap character movement keys fine, but vehicle controls remain bound to WASD regardless of what I bind them to in game. I have issues with autohotkey, with keys getting stuck in a down state constantly, so that’s a poor option. Any other way to rebind vehicle movement? Thanks.