I like using the onglette or what the jewelers here on Philadelphia's Jeweler’s Row call a "Shad Belly" due to the fish belly shape of the graver. This would be a great improvement over the commonly purchased onglette gravers in that they do not come in HS Steel, and tend to dull quickly.
Having a High-speed Steel or super hard onglette would be a great improvement.
One question: I assume that how much you grind the curvature would determine how thin the graver would be, am I correct?
And when do you think this template will be available for purchase?