How to change mod target for stellar blade in pak file?

Hi, is there any way to modify pak files to target different costumes in Stellar Blade? I have mods that target same costumes. It uses ucas and utoc format. I watched a guide for modding this game and only thing i can think of is extracting with FModel the mode, importing it in blender and then exporting fbx into Unreal to change the names for the meshes in there, basically following the guide.

I tried this but the mesh did not load at all, also the extracted mod looks weird in Fmodel in terms of textures so i dont even know if this is a valid method. And blender part feels like unnecessary step, but i dont know how to eccess the skeleton any other way, to be able to change the path to it Unreal.