Is it possible to the flags that a nation uses via save file editing?

[Zimad01]

I've recently started a new game, and I like using client states. Is it possible to change the flags that they and other generated countries get? Would it be possible via save file editing or would it require making a flag changing event or smth?

[Menkerot]

Yes, it is possible. Check this out:

https://imperator.paradoxwikis.com/Modding