That justifies even more that it should be allowed, because it's just flavor.Because CoC for a level 80 is just flavor. They can’t use Adv just that they can knock knock level 30 and under
So if someone is willing to give up a huge asset for their PC (advanced Conqueror's), just so their NPC can have flavor Conqueror's to knock out fodder, why would that not be allowed?
It's like a self-inflicted debuff all for story purposes.
Anyway if the GMs want, they can vote on it, I don't mind either way.