@Deviator
Awesome, thank you so much for some insight and the save file. I'll have to put a notice on the download that it probably wont be immediately compatible with other anvil adjusting mods. Due to the current nature of the Anvil / helve hammer relationship I had to use Harmony to completely replace the vanilla event methods in order to change the recipes it would accept. (it also has some small fixes such as, being able to retrieve an ingot once placed on the anvil without it auto converting to arrowheads; which happens in vanilla.)
I'll reach out to them though and see if they their project is open source enough for me to research if its possible to integrate as, given what I learned building this mod, they probably had to do something similar to change how the individual ingot voxels are managed.
again, thank you so much! I don't run many other mods and it hadn't occurred to me for some reason /facepalm.