Default fingernails

Hello! When we received the werewolf playset, I noticed that the werewolf-sim had permanent fingernails. Then I thought about making permanent fingernails for human-sims. But no matter how much I try, it doesn't work. I copied the fingernails from the base game, set the settings that are usually used for default replacements, but nothing.. I also tried to copy werewolf nails and they only worked on werewolves, not humans. I mean, they showed up in the fingernails section, but they weren't automatically put on. Perhaps you know how to do this?