That does sound interesting. More captain-vs-captain than facing off against supermen or gods or what have you.
It'd be good to play a good chunk of the movie from the hostiles side as well, get both perspectives and make it more of an intense psychological movie, looking at the people behind the situation, rather than 'look at our big expensive CGI shots'.
Maybe Kirk facing off against a Klingon female (so that way there would be no speculation if it was Kang, Kor or Koloth).
Good show Kirkus. You're few lines of an idea is getting me more interested than the trailer for STID.