Stronghold Librarian

My idea for this would be very simple. When locating a stronghold and the library(s) within it, you will encounter a Stronghold Librarian in one of them. This is a villager similar to that of a wandering trader. He is not tied to a village and offers different trades than most villagers. In fact, the stronghold librarian only trades for emeralds and enchanted books. The stronghold librarian would ask for specific enchanted books and trade large amounts of emeralds for them. Or trade books for emeralds. (if the book has multiple enchantments on it, he would award you some extra emeralds for the extra enchantments) And it's really as simple as that. The SL would look similar to a normal librarian, but would look old. Give him some facial hair. Give him custom sounds. Do whatever you want I just want a stronghold librarian.