Custom Hero Removal After Purchase

I searched for the answer to this, but never quite found what I needed.

I'm having a problem with getting a custom hero to be permanently removed from a tavern after it is purchased. I based the heroes off of the Naga Sea Witch, and have no problems at all paying the cost and receiving the hero under my control. If I set Stock Replenish Interval to 0, the hero is just always available at my Max of 1. I've also tried using a Trigger with the action "Neutral Building - Remove (Unit-type of (Sold unit)) from <structure>" to remove it when the hero is sold, but that doesn't work either. How can I keep the stock at 0 or remove the hero entirely from the tavern after someone buys it?

yeah i had the same problem with an alter when i made heroes
the only way i found to fix it was to just edit a melee hero.
sorry

Remove Unit from Tavern means remove unit from stock, iirc.

I believe Hezza's method is the only working one. If there is another, it has slipped my mind.

I believe that I have found a solution to my own question. Do not set the heroes that you want the tavern to sell in the object editor. During initialization (or whenever you want), use a trigger to add the heroes to the tavern. They will show up with a stock of 1, and will be completely removed from the tavern when someone hires it.

try adjust it so it works for each players

He didn't say he wanted each player to be able to buy one.