Okay, rethought my design, made this one with more references to the way Medang kingdom worked:
UA: Benefits of Holiness
Whenever a new
citizen is born, carry over 5% of the
food that was required for the city to grow to its current size as
gold and
culture per each religious structure in the city. Upon completing a religious structure, gain
great person points per each
citizen in the empire.
UI: Candi
Unlocked at construction. May only be built on flatlands adjacent to cities or on farms, and never adjacent to each other. +1
culture and +1
faith, increased by 1 per each religion in the city. +1
great engineer points, increased by 1 per each religious building in the city when building a wonder.
UU: Rakryan Kanuruhan
Replaces great engineer. May be consumed for holy sites. When stationed in a city, causes food generating improvements yield
gold equal to their
food output if adjacent to a
faith generating improvement.
Decision: Implement the Sima system
Requirements: must have researched civil service, must have at least 50 citizens in the empire.
Costs: 2 magistrates
Rewards: +1
food from farms adjacent to fresh water tiles.
Decision: Create the Watukura Stele
Requirements: must have built at least 1 wonder, must have researched engineering, must have a holy site.
Costs: 2 magistrates, 333
culture.
Rewards: Gain a Rakryan Kanuruhan. Consuming Rakryan Kanuruhan grants +1 magistrates.
Notice the synergy between the UU and UI: instead of rushing wonders with great engineers, gain more great engineers while building them, which will further increase your faiths and gold output, allowing you to buy more religious buildings.