Except that my mod doesn't affect the Skill/Attribute books. Those two specific skillbooks function differently than the other skillbooks code-wise and there is no option in the Template to prevent them from disappearing. It would also be broken, allowing infinite Skill/Attribute point gains.
Getting the vendor to spawn two books, on the other hand, might be possible. I'll have to look into it.
Ah. I guess I didn't read his request properly. My bad.