My preference for viewing the bevel is below, small and handy, easily taken along to take a good look at prospective purchases. I have used the type you pictured and personally find it cumbersome.
Right just found a bigger rabbet hole and found the mad hatter lol, right bought these and they are on route
King KW-65 #1000/6000 w/nagura
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Second one Shapton M5 Cream #1000 sharpner
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THURINGIAN CELEBRATED WATER RAZOR HONE
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And the last one
Chinese Straight Razor Hone + JNAT nagura
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So down this Rabbet hole I went.
I have never used a welsh slate. But as for the Naniwa setup I rather like it. Very easy to use with good consistency. The only thing I like better is lapping film. I post finish on lapped balsa with a careful application of diamond paste. Nothing better. Period.
The Shapton 1K is an awesome bevel setter. Go easy, as it will remove a lot of metal quickly. Looks like you are officially on the road . Excellent!
The Thuri looks like it needs to be lapped. Once that's done, I expect it will be the best finisher. I'd probably go to it right off the 6k, but you may find it easier to use the Welsh or Cnat with jnat slurry then to the Thuri since the Thuri is 1*5", and may require you to go very slow until you get used to it.
Thanks alpster and yes Shawn said about them being keen.