Librarians don’t sell enchanted books, but can copy books found elsewhere

Like many others, I like the idea of changing the Librarian villagers’ trading mechanics, however I feel it is mandatory for librarians to offer max enchanted books. My suggestion for this mechanic is that enchanted books should be found in structures more often, and you can bring these books you find to villagers to copy for a fee. I also think an idea to be explored is alongside an appropriate fee for this service, the book copying should take time as well, the GUI could be similar to that of a furnace, the higher the level of the book the longer the copying process takes. I like these ideas because they encourage exploration, and also take inspiration from the addition of armor trims, which can be duplicated. To offer more balance I also suggest that there be a limit to how many times books can be copied, or maybe over time the enchantment level on copies diminishes. Kind of like “typos” are occurring and making the book less affective (possible lore explanation). I appreciate your time reading my suggestions!