I see this as a judgment call similar to pass interference. The kicking team has to give the kick-cather a fair opportunity to catch the ball; if a K player is dancing around in the receiver's personal space in a distracting way, or hits him before or just as the ball gets there, flag it.
So, it's a little more restrictive on the defender compared to pass interference, but not much.
And, honestly, I think that's no more difficult to detect than whether the K player violated a 2-yard halo around the receiver.
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