I'd love it if we saw a scene of, oh say, Pine and Quinto talking in the lobby of Starfleet Command, and while the camera's focused on them, behind them there would be a small white flash in the distant back left corner of the room. Stewart and de Lancie materialize from afar. Pine and Quinto wouldn't notice and keep talking, but you could just barely see Stewart looking around in a mix of frantic anger and confusion, and then kind of hear Stewart yell, "WHAT DID YOU DO THIS TIME, Q?!", to which he'd respond, "Oh Jean-Luc, what didn't I do?" Then he snaps his fingers and they disappear in a tiny flash again, with nuKirk and nuSpock none the wiser as the movie goes on.