The export/consulate system has so many flaws, so a rework would be very welcome. Getting rid of the Asian’s reliance on Europeans for artillery and having an alliance system more similar to the Africans would be great. Maybe something like the Chinese tributary system could replace or augment it.
For specifically tea themed features, a Tea Plantation for the Asians could be one option they might go with. It could be a way to ramp up export production and would make more sense than Rice Paddies that do everything.
A Teahouse replacement for the Monastery/Tavern would be another change that could be made. I suggested something like that here: