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The norton is logical. It is said to be softer than the glass plate, so you'd be lapping the norton with the shapton instead of the other way around.

I used my DMT 325 to flatten my nakayama. Now I use the nagura stone I bought with it to gently rub it to raise the slurry.

I'd simply ask so if he uses the 1200. and if he does you can buy it for...

I think he uses the 600 or the 1200. Actually I thought it was 800 but if that one doesn't exist, I am probably wrong. Or maybe it is not listed on his site. :shrug:

anyway, he uses higher than...

I am tempted to try out Atoma.
So (www.japan-tool.com) uses these exclusively on his japanese naturals.
They are supposed to be as flat as the dglp, while costing a lot less.