The Work Sharp does create a slightly convex edge.
Basically you are removing metal against a slack belt.
The hard side of the fixture is opposite the side being ground.
Might be a bit of a learning curve doing an axe head though.

I could probably make up a couple "Work Sharp" 120 grit Ceramic belts for harder than heck steel.
------A fringe benefit of my part time job.
I may have to try that twist on some M4 at 63/64 Rc although aluminum oxide seemed work ok on that .
Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".