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Why do you want a narrow hone? If the hone is narrow you increase the possibility of uneven hone wear. That's not good, especially not on bevel setting.

I would use a large coticule like 20x7,5cm...

You CAN use a Coticule as bevelsetter, but the coticules are naturel stones, so there is no way of knowing how fast they cut or what grit they have.

I have four coticules and they are all great...