Not sure if even works anymore though been well over a year since I last tried.
No, it doesn't work that way anymore because
- strats are almost unreachable most of the time, if you are very lucky and have the right (small) map you may can get to the HQ... in like 30 minutes. Not really "quick"
- The flak towers will blow your jeep to smithereens if you actually get there.
Waystin had it right: The best way to get perks
quickly is to up a wirbel and shoot enemies out of the sky. Much more efficient than running supps (which you still can do when no appropriate battle is at hand). Since the introduction of the WW, I never ever had to think about GV perks again, even after resetting my perks.