Hello, me idea is upgrade paper miller / or whole new profesion.
For example, if you as basic cooking research cooking / baking etc now you cant learn, you just create blueprint for this upgraded / new profesion.
The publisher buy blueprint from you, and via some his craft / machine create skillbook what can he sell.
Lategame if he have better skill / better machines he can sell you book witch learn you profesion from skill 4+ to easy catch up market.