You can go that route but if the lobes have any flaking its no good for a regrind thats what happened to me.
On a non hydraulic flat tappet it doesnt matter, but i guess on a roller camshaft its a different story.
Why do you say that? Because of the hardening? If that's so, you need to talk to Ken Heard. He says Mopar hardened their camshafts almost all the way to the core, so hardening is not an issue. He oughtta know.