You proposed a $2500 fine for the coach to be paid personally, cbq? That's a pretty hefty fine, considering most coaches make a supplement some where around $4k to coach baseball. Your plan, as previously stated, is anything but simple.
Look, here's how it's going to go. The T$$AA does not care anything about baseball and does not want to spend anymore time enforcing baseball rules than it has to. With that in mind, they're going to put out a pitch limit, just like the inning limit that has been in place for years now, and will let whoever watches the limit notify them of infractions. If no one (i.e. parent, coach, player, book keeper, etc.) keeps the pitch count, the T$$AA is not going to worry about it.
Coaches are going to be self-enforcing this rule, whatever the limit is, because of the liability. Pitch counts can be really closely estimated by the books, and with apps like gamechanger now, you can go back and find exact pitch counts. T$$AA is going to set the limit and walk away.