So Paul Wesley has been bringing up a Kirk spinoff.
How would that work? A sort of TOS untold tales maybe, covering the last two years of the five year mission? Of course fan films covered that area but were pretty much shut down, and TAS is also said to cover that era. While it would be interesting to have a live action M'ress and Arex, I'm not sure if the budget would really work with the latter. Even Paramount+ Trek with perhaps more budget to play around with then 1987-2005 Trek still largely sticks to realizing regular crew member aliens with latex and makeup and Arex would be kind of tricky to realize without animatronics or CG I think.
I mean we pretty much have most of a TOS recast already, all you really need is McCoy, Sulu and Chekhov, and not really the latter since he wasn't cast until TOS season 2, although of course it's implied in TWOK that he's somewhere on the ship at that time and at least met Khan. I mean we kind of have precedent with M'benga who is still Enterprise crew in TOS and on the ship but only appears in two episodes.
There is of course the gap between The Motion Picture and Wrath of Khan which could be interesting but would be an odd choice.