Add a recipe to the nuclearcraft melter that turns coagulated blood from tinkers into biomes blood for an easy pig iron automation (just like it has for purple slime), or even rotten flesh

Good idea.

I think Rotten Flesh would be the better option here, since there is no way to get Coagulated Blood besides already having coagulated blood in the first place (plus this would be more in line with TCon's current smeltery recipes)