Interesting idea, but why do you need a tournament for that? You could just ask for recorded games and give the prize money to the best time achieved, I think it would attract more players and create more competition.
What I had in mind was indeed to create a mod that would incorporate the Elo rating after the player's name directly in the score. That's indeed something quite different than showing the Elo from an additional overlay, and I'm not sure if it is possible!
For now, I can play this week-end, saturday or sunday, preferably in the evening (around 16, 17, or 18 GMT) or in the morning (around 8 GMT). My availabilities may change depending on visible cup scheduling in parallel :/
What about you?