There are a number of Citation models which can be flown single-pilot if the pilot has a single-pilot type rating and some additional additional equipment is operational. Those same planes are also frequently flown with two pilots.

As a pilot, my advice for a non-pilot author is to avoid including technical details in your story. You'll get them wrong unless you have extensive help from a pilot who's flown that type of airplane before.

But not the Excel/XLS.

Actually many of the smaller/older Citations only require a single pilot. Same for the new(ish) Mustangs. The bigger ones like the 680 require two.

OP: I think the best callouts would be "V1", "Rotate", and possibly "V2".

V1: Go/no-go speed. If an engine fails on the ground above this speed, there won't be enough runway to safely stop.

Rotate: Exactly what you think it means. Pull the nose off the ground.

V2: Airspeed needs to be above to maintain climb in case of an engine failure.

If you want to add different airspeeds to include some dramatic effect, sure, why not, it's a book. But I've been to many movies where there's a flight scene and the writers took a few too many creative liberties. I'm sitting there as a pilot going "LOL nope"

That is my understanding as well.

"But not the Excel/XLS."