For some reason no one ever discovered what was happening on Tarsus (a war, Kudos declared there indepedence, whatever) . The famine eventually ends, but the only survivors are Kudos, Kudos's men, the people who submit to Kudos, and Kirk and his kids (who are hiding somewhere).
Years later (about the time Kirk is 17 or 18) Starfleet finally comes (maybe Jim built something and sent out a distress signal?) Jim meets Spock during the rescue somehow (Maybe he eventually convinces him to join Starfleet and they get together). He may or may not meet Bones, and or Pike there, but please no magically making the whole crew appear or anything.
Bonus: Kirk being overly protective of "his kids."
Characters: Chris Pike, McCoy