There is a working mod, a few people I play with use it but are scared to share it in private because apparently they were told by a user on hongfire named vinplayer that it could be traced back to them if they shared it and that bad things would happen to them.
There is at least one working method, but I don't have it.
Can't you do something like hook into directX or change the files in memory after the game is started? Or visualize hackshield or whatever does the checking to only see the vanilla game files while the rest sees the modded ones? IDK, but I got this game for the nude mod because it looks great, but I've never encountered such a paranoid community. Together we can make the game look better, its not my call and I wouldn't post the tools publicly, but it seems to me that if we work together to be proactive and multilayer protection against detection we should have nothing to worry about.