couldnt u make a whole ass mod by making karyn for example have a diff outfit made by ai art
Technically, yes, but it'd be far more work than you think and require a huge amount of manual image editing.
The way KP and many games work is a paper doll system, where different parts of the image are layered on top of each other to make the final image you see. So, for a simple image of Karryn standing could have the background, main body, left leg, right leg, left arm, right arm, head, eyes, mouth, and hair, then the clothing and other details like cum. This means that for every variation of pose, you need a different image for one or more parts. AI can easily recreate the final image, but no current model (that I know of) is able to create the parts of images needed to do a paper doll system at all, let alone do it well.
Pretty much you could have the AI create an outfit, then manually edit all the layers needed to make the mod, but if you're able to make those edits you probably don't need the AI to do the initial image in the first place.