Religious rebels would be a huge problem to properly simulate. You really end up courting controversy if you go out and try and simulate ethnic and religious conflict in a realistic manner. Best just to leave it alone.
Yes, that is part of why we are suggesting the Taiping rebellion is represented with nationalists, I think.
Im not expert but Hong was trying to establish a kingdom, similar to the Renaissance Vatican with himself in power.
The nationalists would be trying to gain take control of their cores, which would be most of Southern China. A house divided has divided China up so it may be a
challenge to implement.
I believe he saw himself as having been sent to remove the qing from power, so presumably he would want to "replace" china. Once could either have an event that made the supstates be Taiping substates after a Taiping victory, or you could have them left independent, giving great powers a chance to gobble up chunks while the Taiping race to unite them.