I'll second the BYXCO Artic Fox. I have all the BYXCO scythe stones but the Arctic Fox is my favorite. It cuts faster than any fine stone has any business cutting. I use it to sharpen my hand and pocket blades all the time, in addition to my scythe blades of course.
You probably already know the trick of using a sheet of paper as an edge angle guide, right? Bisect a 90 degree corner of a sheet of paper with a fold. Now you've got 45 degrees. Fold it again and you'll have 22.5 degrees. Sit the paper "wedge" on the stone with the angle splayed out a bit for around 20 degrees per side of the blade, which is what I usually shoot-for for my knives. While sharpening, recalibrate your eye and hand as often as necessary with it.