Make him play offline with "Daybreak reward x32" and "Daybreak Fast". The first will give him absurd amounts of Prestige, the second will make it so that he'll see no zombies in the Daybreak game, so he'll just need to wait to complete the game.
only 1 reward will be unlock each play. using other app to make game faster is better you can finish it faster and unlock 3 rewards each time. but hey this is still good if you just want to start daybreak and leave it until it ends since no more zeds attacking you.
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The only downside is the fast one takes a while to finish off wave 7, but it is not terrible.
Thank you @Kick of Silver
Using this they will have a lot of prestige?