This is super easy to do if you use the PEQ Editor built into the EoC.
Go to the AA's tab, select the AA you want to alter in the drop-down, and edit level_req field to whatever you want.
Example:
AA's tab -> Endless Quiver ->
Then click "submit changes"
You may need to reboot the server for this to take effect, I can't remember that portion.
Edit: Be sure to change the cost to "0" in that same menu as well if you're wanting to give it to the class without requiring them to grind for the XP to buy it.
Edit2: Alternatively, perl is also an option. There is the ability to do it like:
sub EVENT_SAY {
if($text=~/hail/i) {
$client->IncrementAA(205);
}
}
This is the only way I am aware of without having to allocate the points yourself. Though, I can't imagine clicking buy to be too hard or strenuous to the player.