Thought of something else, isn't your moustache panache example and just an example of fair use? It doesn't seem like fair use would apply in the case of modifying an existing object to fit a different figure.

Don't get me wrong, I think what you're doing is great. I'm just concerned about the legal and ethical implications. Since you know who the creator is now, have you tried to contact him and inform him of what you're doing? It seems like it would be the polite thing to do in any case.