According to the wiki, and multiple discussions, Dragonborn Black Books (of Hermaneous-Mora) remain as quest items and cannot be dropped or sold even after the relevant quests are complete.
These discussions may be outdated. Are Black Books still not droppable even in the special edition?
To try to solve this I've looked at the mod Black Books Begone and Droppable Dragonborn Black Books, but they each have drawbacks: the first lets you drop them only in a specific house, the second appears to have a lot of bugs.
I also imagine there are ways using the console, but I haven't been able to figure out how to accomplish that safely.
How can I drop Black Books, without causing their quests to break, introducing bugs, or interfering with any mods?
Solutions that work for either the Special Edition, or the Non Special Edition, would both help.