It's nothing personal, but it's sort of taboo to publically edit someone else's mod without permission, and I really don't want to create a whole new "Create Undead" mechanic when there are already so many... You could try
JPM's Miniature Necromancy, though. You still need ingredients, but can "Harvest" corpses in such a way as one will give you all the ingredients you need for 1 skeleton, (Two skeletons if you have a pelvis and skull for other reasons) one zombie, or one ghost. The Blackened Soul Gems aren't hard to get/use, and are recyclable. Soul Trap, kill, conjure your undead, and you get an empty Blackened Soul Gem back.