Does it have OBDII?
Each step was an improvement. How many vortex generators did you try. In all cases, the air abaft the window frame is running upward.
Do you think a continuous [smol] wickerbill might trip the airflow so that it reattaches without changing direction? That crossflow interacts with the air that flows straight back and the shear is going to create turbulence.
It might look like one of those plastic wind deflectors cut down to a fraction of an inch, with a serrated edge to quieten it.
edit: as soon as I closed the tab, the next one was this:
All new toyota Gazoo Gr DKR hilux t1+ ready for dakar 2022
You can only see it for the first few seconds, thereafter all long shots.