For those interested, a picture of the original Kirk/David fight from TWOK is in the Star Trek: The Wrath of Khan movie magazine from 1982. Kirk is on the floor, and David is standing over him with a knife.
Is it this picture?
In the already mentioned Star Blazer magazine there is also a behind the scene.
There were several photos of cut scenes from TWOK that appeared in vintage 1982 era magazines like Fantastic Films and Cinefantastique that I never saw anywhere else including McCoy working on Chekov's ear and Chekov waking up and demanding to to be able to go to the bridge--both were during the part where Ent is heading into the nebula for the final battle. i never saw these photos again sadly after losing those magazines to a water leak.