How to package a texture mod in Unreal Engine 5?

I’m attempting to create a texture mod for Lords of the Fallen. When I cook and package with the shipping configuration, my resulting .pak/.utoc./ucas DO contain the modified textures…

However they also contain all the default Engine data. It results in the game crashing of course.

How do I cook/package JUST the textures I made without all the Engine data?

Any help is appreciated, I’ve been at this for hours!