As far as JNats go, you don’t need a coatse(r) stone, just a fast one. Many of my razors finishers would set a bevel easily.
Yeah, but that’s cos in the topsy-turvy-world-of-jnats everthing’s the wrong way round. And it’s only the hyper fine ones that are actually reasonably quick. Try setting a bevel with a coarse Japanese stone and you’ll be stuck there forever!