Well, when I am in the mood I go from one of those "narutakis" I have, which I estimate to be around the 6K mark (perhaps slightly higher) straight to the nakayama asagi. It does take longer than if I inserted an intermediate grit hone in there, but it is not prohibitively long, at least in my experience.
Mind you, since I got that Ozuku suita working again I rarely jump from the 6 to the Asagi any more.
I also often go from the Shapt 16 to the asagi too. Works fine. There's many ways to skin a cat, as my grandmother used to say!
James.