Kirk here, partially answering my own question about where to experience wagashi making in Kumamoto with this web page from the Explore Kumamoto site:
https://explore-kumamoto.com/japanese-sweets-making-experience/
Still looking for feedback and more information, though. Here's the address of my previous post on the topic:
https://www.facebook.com/Kumamotoi/posts/pfbid03wi1dxej83GTJhiwLSaVTHYfWsDWPCc5sN8nYpGxXCynio55bAt6QS6AUyEZ4FLTl
Japanese Sweets Making Experience - Explore Kumamoto
Fun and memorable! Tenmeido's Japanese Sweets Making Experience. Learn how to make and eat artistic nerikiri wagashi from a master craftsman.