I would vote for an arabia tournament with random civs, best of 3 where the 2nd game players would need to use the civ adversary used on g1, and then on g3 if needed a pick civ game.
ps: i would hate a new moth tourney, huns wars are so boring nowadays, just drush fc ca, so bored of it
4vs4 with everyone spamming skirms to a set point in the middle of the map
i'd propose a next "WCL" where the requirement is 17+
after everyone signs up (individual players), teams are made based on ratings, to make all teams more or less = in rating.
so you'd have a 2500 + 1700 + 1800 vs 2300 + 1800 + 1900 vs 2400 + 1700 + 1900 etc