Which Orc hero do you prefer?

it's possible to have some fun with this: if there's a mentor nearby, you can periodically remove the "protect us all" skill and then re-learn it.

Fortunately, you can't do that, because you only get the Hoplites once, and if you level up again, you won't get anything. So, it's not an option; His Majesty Balance won't allow it.