Yes, possession of the ball is not a requirement for hurdling, but...
Hurdling is only a foul if the player being hurdled only has his feet on the ground (no hands, etc., touching). I've seen many a longsnapper drop to his hands after the snap (a four point stance, essentially). If the jump happened after this point, it would technically be legal.
If he wants his linebacker to get a running start, I don't think he'd be able to wait long enough.