Hello! Is it possible to modify the BAI on startpos.esf?

I want to make Maratha less aggressive, maybe like Mughal. I tried changing starting money(20.000 for Mughal and 0 for Maratha) and improving unit roster of Mughal but didn't work. Maratha just ignores what I do. I heard, an input like "maintainence" instead of "progressive" could solve the problem, but I don't know how to do it without breaking the game.

If there are other ways of changing the BAI, I am glad to hear.

I don't want to play with large mods, since I am happy with the Vanilla overall.

Your comments are appreciated.