Studies show that 97.2% of the time the replant and push is moot since it is proceeded by a leap. This is certainly the case with pitchers like Barnhill and Silkwood. If you fix the leap issue you can then address the other 2.8%.These types of scrutiny are used in other sports to confirm a clear-cut, yes-or-no issue,
that may have been mis-perceived in real-time by the officials.
Think: buzzer-beater basketball shots, tennis serves catching the line, tags at second base on a steal attempt, a wide receiver dragging his toe as he sails out-of-bounds, etc.
These rulings are (usually) 100% confirmed or reversed by the replay, if the camera-angle was sufficient to see the play clearly.
So, your suggestions may work to detect a leap, (I'm hearing the *beep* that sounds when a tennis serve lands beyond the service line...),
because either you are airborne, or you are not - and that is easy to confirm or reverse.
but they still do not solve the "2nd push" infraction.
To rule on it, makes it a judgement call by the umpire,
whether observed in real-time, or in replay.
I think in many cases, and certainly Barnhill, the 2nd push is akin to something like Allen Iverson's crossover: does he carry the ball?
This particular infraction has to be *really obvious* to get called.