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Doesn't exist and the O6 isn't all that practical unless you're not traveling, such as in a life raft. Too slow, too much effort otherwise.
Thanks all for the input. I wouldn't want to spend more than about $200, and as they don't seem to exist (thanks Doug, saved more fruitless searching!), looks like we'll be going elsewhere!

As an aside, I've been looking for a normal water filter in the event we go elsewhere. Interestingly, the Katadyn Hiker microfilter costs $AUD169.95 through Prepare2Survive Australia (and costs similar at retail stores too), however it only costs about $AUD90 through Brigade Quartermasters in the US - and that's including conversion rate and shipping!