Another possibility that occured to me just as I hit "send" would be to contact a local Buddhist church that is primarily Japanese ethnicity. There is some chance you might find someone there who is still making miso.
A google search for "how to make miso paste" turns up quite a few listings, including some videos on the process. i.e.
http://newzealandbento.blogspot.com/2009/04/i-make-miso-from-scratch-well-mostly.html
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