Troy, I have the Flattener 4 if you want to swing by and give it a try. I also asked Astronomics about their flattener, and they said that they would ship to Australia, with an estimate of about $30USD for shipping.
One of the flaws with the Flattener 4 is that they didn't include a set screw to lock it, so if you bump the rotating barrel on it while imaging the focal length can shift. This could be easily fixed with some adhesive backed velcro, which would still allow you to adjust the positioning if needed.
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