I was in the process of rewriting it when I realized a National Wonder would work. It's up to date now:
The free technology replaces the similar effect that was on the trait. It's basically like a combination of the old Great Library plus a sci-focused Statue of Liberty, all in the Classical era.
- Sejong: +1 Science from Farms. (renamed "Choson Dynasty")
- Sejong: Jade Hall national wonder gives 1 free technology, and +2 for all specialists in all cities.
Is the Jade Hall supposed to be exempt from the libraries in 75% of cities requirement? I hesitated to report it as a bug or oversight in case it was intended.
Wonderful mod by the way