What might be interesting is some sort of bonus that only goes to, say, the top 20 members of the clan that owns the most villages. (For some value of "top 20".)
Although I'm generally in favor of saying "maybe we should not all be allies just for the sake of having a war", I also like it when games generate rules that automatically take this sort of thing into account.
Still, awfully silly to play a beta wargame and all ally up. "Welp! Looks like we're all friends here! No need to test the war!"