That's why those two small planks on Concorde work so well.
Quite a common trick of the trade eg with fighters eg the leading edge extension (LEX - the narrow aspect delta at the front of the wing) on the F18 and others. There are plenty of pix around with the vortex made visual due humidity and it can be seen to be tight, curly and designed nicely to interact with the fins - which, for the F18 has caused much in the way of fatigue related grey hairs in the boffin fraternity.
and especially it's used in moving the CofG.
again, a common observation eg 747-400 tail tanks .. just a matter of how much the movement is required to be.