Star Trek Continues (a youube fan series) did a lovely sequel to “Mirror-Mirror” called “Fairest of them all”
https://www.youtube.com/watch?v=dJf2ovQtI6w
Unfortunately, that series, along with Axanar, is gonzo due to Paramont/CBS draconian fan rules. “Star Trek Continues” was given a Cease and Desist order and will close shortly.
They have been give the courtesy of finishing up their last three episodes which were fully funded...but no more.
Give me Axanar!!!!!