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Ha No Kuromaku (Shapton 12k)

"90% of the work is at bevel set so then everything is mostly a synthetic edge unless you use a coticule or similar for everything."

Not to me. I don't need to bevel set on a coitcule to have a...

No doubt this would save a ton of time! But,its mostly a synthetic edge.
I would at least go to 8k then maybe a tomo slurry to basestone or slurried base stone (light slurries) to get the full Jnat...

He hasn't posted in three years so you may not get a response.
I would start from a good 3-4k edge and not a 1k. Botan roughly a 3k . Just my 2 cents.