If everything fails, you can always make new textures and change the meshes a bit. Maybe add more detail, they could use it... after that they are technically not the ripped models anymore, right?
(Well, legally they are, I guess, but hey who's going to be able to prove it...)
Anyway I'll be following this CS with interest. It's a pretty serious setting you're tackling there, so I wonder in what direction the story will go. Over-the-top dark humor like wolfenstein or gritty, precisely researched realism?