This really seems like, if implemented, it would work best as a subset of Cooking. I must imagine that you've certainly heard it a lot throughout this thread, but it does bear repeating. Cooking as a skill in Runescape is food preparation, which is ultimately what your proposal is - food preparation. The skillsets are disparate, sure, but they're similar enough that implementing butchery would be better suited to being a subset of Cooking, certainly more suited than even all the skills that compose Crafting (which is a debate that could be had in its own right, to be honest, but something tells me that would be a pretty dang big hornet's nest for me to kick.)
So, while I'm going to say this isn't a good idea for a separate skill, I do think the concept is there for a subskill at least. It definitely seems like you should get more than one steak out of a cow at any rate and I could see a similar concept to cheese wheels working here. Soft no; not as an independent skill, but maybe it could feature in an update to Cooking
a la
the Mining/Smithing update.
08-Oct-2020 06:39:02