Tournament or Best-of-N format that encourages mirror matchups

I realize this might be better on AoEZone or something; feel free to repost and discuss it there.

In the NAC2 final, Jordan described how mirror matchups can seem more decisive because there's no civ win. It's just boring if you always play with the same few civs in a mirror matchup with only a few strategies.

What if you had a pick between "civ you selected and think is good", and "a bad civ that the other player can also access"? It can't be a good civ because then the first option wouldn't matter. To make it so people actually pick it, and both players sometimes pick it so there's a mirror match, you have to give them a reason to.

So you do something like a normal draft. Either you use up all civilizations but one, or you randomly select an unpicked civ as the alternative choice. If you pick all civs but one but have fewer games planned, you can either give a bunch of bans, or just have only the first few picks count and the rest are just to determine what you don't want the alternative to be. If there's a civ that people don't like playing as or against, like Koreans, different systems affect chance of this civ being the alternative.

For a game, players secretly select their civ, but before launching the game. Either you physically write it on a piece of paper or do some online equivalent. Then both players reveal their civs and both have the choice of using the alternative civ instead, but this choice is hidden until the game starts.

So if Vietnamese is the alternative, and the picks are Mayans and Goths, both players have to decide if they think the other player will opt for Vietnamese instead and whether they should as well.

This results in mirror-matchups between civs seen as the worst in the game, instead of between the best as it was with Hun wars in AoC (the situation Jordan described of only four civs being viable and how boring that became).