Funny I should stumble upon this post. My dad is a semi retired coin and medal maker. What you want to achieve is called 'hobbing' and a normal hydraulic hobbing press is about 750 tonne.
My dad's dies, for thin sheet stamping of plaques are always cut in the negative from a resin positive on a pantograph machine, controlled by hand. We cut them in 'grane' a swedish tool steel or 'tyssen 2767' they are then hardened under vacuum.
We use them on a 1880's drop hammer, what press do you have?