Really, as much as I dislike Tauran, he has a point on the removed VAs. They should simply be removed altogether from the game starting next season (Scat Back, Zone Spec, Jack Hammer) and the VPs returned to the player to be spent on something else. Considering the player should have their boost still for the season, they can then re-up those new SAs instead in order to maintain functionality.
It's silly to put a loophole in the system that can be exploited such as: put 1 point in any of them this season so that you can max them later!
Hell if your really worried about messing up builds that depend on these things (really we are only talking about Scat Back since Jack Hammer is relatively useless in the current sim, as is Zone Spec since it has been nerfed) at the highest levels, then make it to where the only players that get to keep them are those that will be 441+ days old at the start of next season. Essentially anyone that wont have a boost to add points into the new SA would be grandfathered, all others must adjust by dumping SP into the new SAs.