It would have been funny if Chris Pine presented an award later in the show, then Shatner as future Kirk could come back "on screen" and give Pine some tips on how to REALLY present an award. Lots of jokes could have been made there. That would have been good! Although I'm not sure the Oscar writers could have pulled it off.
Actually, Pine and Saldana did
present some technical awards later in the broadcast, but they didn't interact with Shatner.