Basically I have copied parts of this class https://github.com/EpicGames/UnrealEngine/blob/c9f4efe690de8b3b72a11223865c623ca0ee7086/Engine/Source/Runtime/Engine/Private/Vehicles/WheeledVehicleMovementComponent4W.cpp into a new one. That way I was able to change all calls to the physx vehicle.