Guild of mercenaries.

A clan hires a mercenary to participate in a specific tournament and, consequently, to gain something from it. After all, the mercenary will be playing for the clan. Even if Mr. Kamikadze doesn't notice that in this case, the player represents the clan's interests, the clan itself (in my opinion) will immediately remind him of this.

It's much simpler. After registration in the application table, Player X (Clan Y) is indicated, and that's it...

:)
And what makes you think that the rating system will take this into account?
You didn't understand the idea, though. :)
I'm saying that the entire forum needs to agree on something, not engage in individual initiatives.
For example, a new regulation regarding clans was adopted.
P.S.
And right now, mercenaries are something like: a way out of a situation when a clan cannot play independently (one wonders, why was the clan created in the first place?).