S30V and S35VN are very tough (in my opinion) even in their annealed state, which is before heat treating. This is my experience from grinding them with high quality belts on a quality belt grinder. I couldn't imagine trying to tackle them with files, although I'm sure that many people have done so.
If you want to do this with stainless steel, then perhaps a 440c would be best, but hopefully others with more experience than myself will give you more guidance soon.
Mike L.