I'm not sure that your objective is possible at all.
Do you want the AI to play all factions for some turns?
I know there is a method to make the AI play the game (I think the option -ai in the desktop shortcut), but I wonder if you can retrieve the control of the game after some turns.
For example, I would try a background script (started directly at the beginning of the campaign) with the console_command control romans_julii option after some turns.
As one possibility:
Code:
script
declare_counter loop
monitor_event FactionTurnStart FactionType romans_julii
and I_TurnNumber = 2
console_command control romans_julii
terminate_monitor
end_monitor
while I_CompareCounter loop = 0
end_while
end_script
It is only a draft, but perhaps you can calibrate if the solution is possible.
After that, if really you can play julii, you must save the game and load the saved campaign with a normal shortcut to RTW (without -ai option). In such case the background script won't work.
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