FESS, may I make a suggestion, Sir....
You posted something regarding possibly needing to initially rank participants via their perceived skill level...
I recommend setting up your "Dueling Ladder" to where anyone who signs up is coming in to the event on an even/equal status, which would be "Not Ranked"....the dueling ladder itself will provide the ranking all by itself, and everyone signed up knows going in that everyone is starting off on the same terms!
Hope this helps
TC