How about a string with knots tied in it? A length of braided nylon mason's cord would work nicely. Or how about a piece of stainless steel brake cable you swipe from your neighbor kid's bicycle? It is quite thin and flexible. That will teach him not to ride across your lawn. You could tie a stainless steel nut on the end of it. You'd be able to sanitize it easily enough by just dunking it in a beer glass full if Star San if you felt the need to sanitize it. You could keep it in your pocket so you would always have it close at hand.
I, too, could go on but I won't. The Packer game is starting to get interesting. I think marking your spoon handle is the best suggestion.