Now I've seen your handle I might have to polish one of mine , (I've got handle envy) they do make great door knockers I would imagine. You wouldn't want to drop one one on your foot if You only had your socks on, there's a bit of weight about them. You could also use a Chubb fish escutcheon as the base to knock it on! But if you weren't a locksmith,collector or in the trade that might just get translated as weird/tacky I would imagine.