Can't really recommend it but it does exist and makes keg sized batches. I'm pretty sure their output would qualify as nano but I could be wrong.
http://r.tabeni.co/zigzag
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How the heck is that legal? From my understanding, to get a license, you need to brew (and pay tax on) a minimum of 60,000 liters a year. Is there a special exemption for brewpubs that I never heard about? That would be awesome!