Ability cooldown reset

Is there a native that can reset a particular ability cooldown for a hero? I have a work-around but a single native would be helpful.

well if you remove spell book and chaos it and give back spell book all cooldowns are set i dunno if that helps, you can chaos the unit to itself i guess

The only function I can find that deals with cooldowns is UnitResetCooldown :/

No. You'll have to use a workaround.

Remove the ability and add it back?

Store the ability level, remove the ability, add it again and reset the level.

Here is Blade's function to do it if you're lazy:
http://www.wc3jass.com/viewtopic.php?t=2056