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my suita is either Shoubudani or Okudo. The seller was mostly sure it was Okudo.

It is an amazing hone.

It was more of a "this is interesting to think about" than a "I need to try this" kind of thought. Currently I am using (Okudo?) Shiro suita to Nakayama Namito to Nakayama Asagi after my Aoto or...

The su are kind of cool because the particles stay in them until floated out by water (if I understand correctly). So, with the suita the effect might be prolonged.

As for Japanese naturals from...

Because of the Su. Some of the Cerium would get caught in the su and could give you the honing power of the suita with the fineness of the cerium.

It might be interesting to try this in combination with a Japanese natural (preferably suita).