#3 Match
Floyd Mayweather made the brief move over from the world of boxing to fight Big Show at WrestleMania 24, so this seems well within the boundaries of logic. It doesn't have to be a technical masterpiece and it can even be a no disqualification, so long as this actually happens one day.
It would draw in some MMA fans and the odds of the fighter actually getting injured are extremely small.
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Business wise this is a no brainer for Dana White because he could help to orchestrate every single part of the match. He's smart enough to deny Vince full creative control and this could be the smartest way in which WWE and UFC could possibly work together.
It may come across as a little bit cringeworthy, but WWE knows how to make things like this work effectively. Now to something a little bit more low key.