I read that California schools, where they can't bring a pen knife, allow the Kirpan provided it's blunted and riveted into a sheath...
If it’s riveted into a sheath, it seems that it would at least be safe.
Would it be considered jewelry? It’s been rendered nonfunctional & it adorns the body, like a belt buckle, or a ring. It seems to me that the definition of "jewelry" has a lot of grey areas.