Well, there's a few problems I see. You can't use all these strategies on the same turn, for one thing. You probably want to set up TR as soon as you come out, but you can't, because you want to use fake out. So, there's one problem I notice. Two, you can only have a minimum amount of time for him, and considering he's very frail, you're going to have to do quite a bit of predictions to compensate. If you predict wrong, your opponent will attack Mr. Mime and get rid of him, although I don't see this as the case, considering that Marowak would be a threat and your opponent would most likely aim for him. However, I do see a novel use for this. Since your opponent sees Marowak, they'll know you have trick room in store, so using Fake Out will surprise your opponent, but they will probably attack with both pokemon anyways, so one of your pokemon is likely to go down. If you can do the amount of prediction necessary and supply Mr. Mime with a focus sash, you may be able to get away safely, but the problem I see is that if you use Fake Out, the opponent is free to attack Mr. Mime with his other pokemon, and if he brings you down to Mr. Mime's sash, Mr. Mime won't live another turn to set up Trick room. However, I'd recommend you send out a tank instead of Marowak, since Marowak probably won't live the first turn to use Swords Dance, so it may be smart to send it out later, but that's all a matter of prediction. And there's also the problem of setting up screens, which is admittedly easier when in Trick room, but you still have to set up Trick Room.