Not having any easy access to "Granny Grating" in Australia, fly swatters are a nice (and cheap) alternative.
Wonder how small the gaps in swatters are down there. The ones up here are practically perfect for figures to stick their feet in, so to say. Granny grating, at least here in town, is worth peanuts. A buck gets you a nice and large sheet of the stuff.
I bet you'd get a few odd looks during a raid of the local shops for a dozen swatters, eh?
Another good one is car repair mesh which is bendable metal.
Never had the pleasure to work with this stuff though...