Yvori
Terrarian
Ah. We hadn't gotten the Pandolar yet in this world.
It's still a ridiculous recipe, though, so the sheer amount of leather needed should be greatly reduced. That way it's at least sensibly farmable before getting the Pandolar.
"Aherm" or not, that currrent workaround feels like exactly that: A poor workaround to justify an unnecessarily difficult recipe. (One which also throws out the balance of numerous other mods that use Leather's rarity in a reasonable manner to make some recipes harder. Two copper per piece isn't much.)