Sorry there, I realize that read a little hostile. No hostility meant.
There have been TOSifications of the Miranda. The best one's called the Surya
class, I think. I would imagine the new Reliant
would just have a different registry number, rather than an 'A' or 'II'.
I believe in the novels, Chekov became Sulu's first officer after TUC.
It always struck me as odd that he was the only one of the TOS crew that actually seemed to move on with his career, other than Sulu later. (Of course, Sulu was supposed to be referenced as getting a command in TWOK to appease George Takei until it was cut out.)