The NFHS has indicated that while what you say about crossing the line first is true, a single motion in crossing the line and touching the ball is treated as touching the ball.
That said, it is written with the context of being in the throwers hands. In reading the rule, it seems a delay warning might be in order:
Rule 9-2 Penalties:
Quote:
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3. If an opponent(s) reaches through the throw-in boundary-line plane and touches or dislodges the ball while in possession of the thrower or being passed to a teammate outside the boundary line (as in 7-5-7), a technical foul shall be charged to the offender. No warning for delay required. See 10-3-10 Penalty.
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This rule doesn't actually cover the situation where the ball is on the ground for the resuming play procedure. So, is it really a T if it is not in the hands of the thrower? Perhaps there is a case play that covers this. (I need to get to bed so I'm not going to search for it tonight).