Yes, I think I do.You just need to do some research trials then. There's probably nothing on youtube because no one does it, as it's an obscure activity to say the least.
To be honest, you have landed yourself at the pointy end of known knowns and unknown knowns, but you have at least identified one of the known unknowns.
If you see what I mean.
but how hard can it be? It’s just a cut with a curved chisel. Not exactly Michelangelo. Here’s an original one from a Wooding plane.