I think you can make this play with a M of 20 with 99+, plus AK. I think only making this play with a mid pair in late position or AK really hampers your playing style. You will be seen as predictable by people, who you could play with later in future tournaments or in this tournament if you double up and are forced to push again a half hour later. Open pushing QQ, KK, or AA also will be a surprise to your opponents who may call with a mid pocket pair expecting a coinflip, in which case they are a 54-46 fav.