Slight Rework / Addition to the Enchantments System

One very upsetting thing about the enchantment system right now is the fact that sometimes, enchanting books to get good enchants to make good armor is not only very grindy and frankly boring, but you may get certain enchantments that you don't want. Like, if I want Protection 4 on my armor, and I get two books, both have Prot 3 but one of the books has Smite 1 on it, trying to combine good enchants to make a good set of gear is too expensive. This is upsetting. I personally have a Prot 4, Feather Falling 3, Unbreaking 3, Depth Strider  3 book for my boots. Unfortunately, one of the books down the line had Smite 1 on it and not only can I not remove Smite 1 without disenchanting the entire thing, but I can't add my mending book or apply it to my boots. There should be a block or some way to separate books from each other. Maybe, a Separator block, so I can put that book into it and get separate enchanted books for every enchantment on that one book. It could cost some XP and obviously, re-combining all of the books would also cost xp, but you wouldn't have to worry nearly as much about unwanted enchants messing up a long and tedious grind for good armor enchants.