Let me see if this would play in Peoria.
<cue TPIR harp> If I were EP:
Under the assumption that there was an hour of show time, play three full game cycles, round one, Sudden Death, Wonderwall. Once you get to Sudden Death or time ends, you're done. So 18 people will get to play the game proper, and we get another Wonderwall. Just cut that part between the last break and the end, and that should free up enough time for the extra game.
(I'd also cut the prize money, but that's neither here nor there.)