Thanks for this discussion about an interesting example of a vortex generator!
Ever looked at a Concorde?
There are two 'vortex generators/chines/strakes' (whatever you want to call them) on the forward fuselage, roughly under the cockpit windows.
They don't look prepossessing at all, but they really "stick down'' the airflow over the entire top of the fuselage, even at quite high angles of attack, and prevent the lower part of the vertical tail ending up in a highly turbulent airflow. It's one of the reasons the Concorde vertical tail isn't all that big, compared to some subsonics, even if she lands at a higher angle of attack.
And an interesting snippet: they were already in place for the first flight of the first prototype in 1969.....
CJ