"shahn" and "sharn" have the exact same sound in Australian English, so I suspect we're trying to express the same thing. According to this website's key, the "shan" pronunciation that Bear is promoting would rhyme with
Dan, "can", "man" etc, while "shahn" / "sharn" would rhyme with "barn", "darn" etc.
~Chrisell~
Proudly Australian
www.archaeochrisell.blogspot.com