I love the way you portrayed the relationship here. As I read it, Spock is able to keep Kirk's lingering radiation sickness at bay with the Vulcan healing trance, which becomes transferred to Kirk through their bond -- is that right? The point tht left me wondering was Spock Prime's suggestion that his own radiation poisoning was healed through the bond between him and his own Kirk. But in TSFS, the radiation poisoning wasn't cured or healed or kept at bay -- Spock's body regenerated from the DNA in the capsule that held his body via the Genesis effect. But your solution is certainly no less logical than that of TSFS! (For starters, how was Spock affected by the instability of the Genesis effect?) But none of that matters next to the joy of seeing Kirk whole again.

This is wonderful!