Tradeable mercenary

I think mercenaries should be tradeable like most of mechanics ended up e.g. Incursions.
Once you hire mercenary let us itemize them into Mercenary Contract in city/hideout.

backstory:
I'm playing with my brother on private league - so it's semi SSF for just 2 of us.
He made a 1500 total dps axe and I have merc with Volcanic Fissure of Snaking.

He wanted to meme with aurabot with mercenary being his damage dealer, yet he cannot find mercenary that is good enough for few days now and I don't need mine as much as he does.



I don't think it's a game breaker, yet it could be nice option to have.

Thanks for your attention,
Stay safe Exiles!