First, I admit, I only read page one of this thread.
Why not compromise and get a really good henna tattoo for the first time or 6? They last about a month so you can adjust to the idea of having one. See if the novelty wears off; after a month, he may forget he has it or wanted it. Plus the first one may not be the one he wants for life? Just a thought. Sorry if someone already suggested this on pages 2 through here.