Are you seriously asking me to admin-hack the game for you to give you strategic help? Yeah no.
I'm pretty sure Shushan will flip, but I don't even know if it's still independent or Babylonian. If it is the latter I would recommend Nighthawk to stay at peace with Tigranes until after it has flipped, as flipping mechanics can get kinda wonky if the newly spawned civ declares war and we don't want a repeat of the main RFC game's events wherein Persia conquered Shushan one turn before it would have flipped, thus making it completely useless as it starts with 0% Persian and 100% Babylonian culture.