(Google translation)
It's amazing that someone has already had similar thoughts as me. And it's a shame that it wasn't reflected in the RFCD in the end.
I had only four titles in mind: Roman Emperor, Persian Emperor (Shahanshah), Indian Emperor, and Chinese Emperor.
It's a bit long, but I'll write all my thoughts here.
- Roman emperor
1. If Rome is spawned and Rome adopts one of the following Civics: Monarchy, Despotism, or Elective, the title will be activated and given to Rome.
2. One of the following Civics is being adopted: Monarchy, Despotism, and Elective.
3. Either Rome (3000) or Byzantium (600), or the previous owner must be made a vassal or destroyed.
4. Must be ruling Rome (3000) or Constantinople (600).
Perhaps a division of the title of Roman emperor between East and West might be necessary, or additional conditions might be needed. In particular, the transfer of titles from Rome to Byzantine is unclear.
If divided, it would be better for the title of Western Roman Emperor to be transferred to German (if Rome falls) and changed to the title of Holy Roman Empire.
Effect of the title of Roman Emperor: Stability bonus. Diplomatic relations bonuses for the UK, France, Spain, Portugal and Italy. Diplomatic relations penalty for Germany (Holy Roman Empire).
- Persian Shahanshah
1. When Persia spawns, it is given to Persia.
2. One of the following Civics is being adopted: Monarchy, Despotism, and Elective.
3. It must be Persia, or the previous owner must be made a vassal or destroyed.
4. It completely dominates Persia, and its capital must be in Persia.
In general, there will be opportunities for the Persians, Turks and Iranians. I think it would be a good idea to include a system that changes the Turk's core in this system.
Effect of Shahanshah of Persia title: Instead of losing the existing core, the Persian region becomes the core region, and the historical expansion of Persia becomes the historical region.
- Indian Emperor
1. It is given to the civilization that satisfies the other conditions first.
2. One of the following Civics is being adopted: Monarchy, Despotism, and Elective.
3. It controls more than 75% of cities in India.
4. If the previous owner exists, the owner must be destroyed or made a vassal.
In general, it would be India, the Tamils, the Mughals, and the British, but it would also be fun to imagine an alternate history in which a Great Power other than the British took control of India. The effect of Delhi becoming the core would be to replace the existing Mughal system.
Effect of the title of Emperor of India: Delhi becomes the core, and all of India becomes the historical domain.
- Emperor of China
1. If China is spawned, it is given to China.
2. One of the following Civics is being adopted: Monarchy, Despotism, and Elective.
3. It controls all cities in North China, and its capital must be in China.
4. If the previous owner exists, the owner must be destroyed or made a vassal.
In the Korean community, it is often expressed as ‘taking the Mandate of Heaven’. It will be easier to understand by referring to the corresponding system in Europa Universalis 4, but the motif is RFCA's system of the same name. A system with the Chinese capital as its core could include Mongolia's existing system.
Effect of the title of Emperor of China: The capital within China becomes the core, and the entire China becomes the historical territory.
I don't know what kind of creative play this system will allow for, but I think it's an attractive system both historically and alternatively.
You may also consider losing the effect of the title after researching the nationalism technology.