Okay. Here's my concept for how they can deal with the Pon Farr issue:
T'Pring survived the destruction of Vulcan, and is still the same cold, self-serving ... person ... that we're familiar with. But Stonn did not survive, nor any other suitors she would consider likely candidates. And with Spock Prime involved in the rebuilding of their society, nuSpock is regarded in a considerably different light by the surviving Vulcans, anyway.
So, Pon Farr approaches for Spock and T'Pring, and T'Pring, despite knowing that Spock has formed a relationship with Uhura, insists on her, um, perogatives. Uhura challenges, resulting in a bout of combat ala Amok Time between her and T'Pring!
Uhura wins somehow, of course, and wins nuSpock - which leaves T'Pring to die alone in the Pon Farr. But Spock Prime takes her, instead, and utilizes the memory of the similarities of his bond with her Prime version to save her and knock her up. "There are too few of us left, and it is logical."
That would be B-plot. A-plot would involve some sort of threat to the new Vulcan colony that Kirk and the rest of the crew are having to deal with while all that is going on.