We've already had Nexus-Kirk retcons in Engines of Destiny and Crucible: Kirk, as well as a few Strange New Worlds stories. So that's already been done. And it can't be the only story the Nexus can lend itself to.
Yeah but Captain Kirk fell down a cliff and died, that traversty needs to be redressed in the mainstream continuity of trek-lit
It really doesn't.
Kirk's time is long done. Leave him be.