I have been working on a modpack with some create mod addons, this one included, and the helve hammer is really cool, but being only able to use it with an anvil for normal recipes, is really a drawback. My suggestion is just to add a field to the recipe, for what block or tag needs to be under the head, defaulting to anvil. This would be a huge improvement for modpack making, which I feel is sort of the purpose of this mod, with so few recipes and such.

Looking though the code, I see this is now possible, I'm sure it was not last time I tried (on and older version), so uh... Thanks, nice mod btw.