Kim Cattral did a tremendous performance and created an interesting Vulcan, she didn't ape Kirstie Alley
Agreed. I really like Cattrall's performance in STVI. She's the big new element in the crew, and she really helps mix things up.
To me, I just don't see Valeris as the Saavik wannabe. Maybe you think a cut and paste approach was obvious, and it may have been, but I and fans who loved the real Saavik would like an appropriate backstory of what she's been doing since. If it was a cut and paste effort, it's another chink in a rushed through script which never had much weight IMO.
It's my understanding that the part didn't change that much from draft to draft. Maybe someone who's read the various drafts of the STVI script can clarify. And as you say, it was a rush job, so they likely didn't do terribly extensive changes.
I would demand Saavik in the conference room with senior brass, by this time I would think she would've earned the rank of Commander. And also, having a moment where it's Kirk, this time, giving the com to Saavik to take the new Enterprise out of space dock. You are right, it was obvious based on those lines.
I personally doubt that Saavik would've been a Commander, as the
Enterprise crew was already top-heavy with upper brass, with three Captains (Kirk, Spock, and Scotty) and three Commanders (McCoy, Uhura, and Chekov). At most, I could see her being a Lt. Commander, maybe.
And yeah, the Spacedock thing was another potential callback to TWOK, right down to Saavik/Valeris quoting regulations to Kirk. That could've been cute.
But honestly, probably the only thing they changed outside of the name was the bit about Lt. Valeris being the first Vulcan to graduate at the top of her class from the Academy, implying that she was a somewhat recent graduate. (And since it doesn't make much sense for a super-smart Vulcan never to have graduated at the top of their class before, I reconcile that in my headcanon by imagining that Valeris graduated from the top of her class at Starfleet Command School).