CTE is not just about concussions but any amount of damage consistently over time that accrues.
Current line of scrimmage situation is the worst case scenario. Linemen are a couple feet away from each other and they start from a crouched position. They explode up and hit the opposing line, very often with their helmet/crown, down after down, 60-70 times a game. You could not plan a better way to get CTE.
1) Neutral zone at the line, they start 2 yards away from each other.
2) Have to start from standing position, and/or:
3) First contact has to be arms
It would be a bit of an adjustment like it was for dynamic kickoff. You're never going to stop all head trauma in a contact sport but the mechanics of the line positions are basically designed for it.