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