As I understand it, in order to make all Argons Asian I would need to look into the character_macros.xml, remove all macros for Argon NPCs that are not Asian (leaving only Asian Argon NPCs) and creating a separate file where I would write <replace sel="/macros"> (meaning I'm replacing all content in the whole macros element), adding the modified xml text (that doesn't contain any definitions for non-Asian Argon NPCs) and closing it with </replace>.
That's for the base game.
However, CoH DLC has its own character_macros.xml file where it adds a brand new definitions for non-Asian Argon NPCs on top of the base game. How can I deal with that? I want to be able to define changes for not only character_macros.xml base game file, but also character_macros.xml files from Split and CoH DLCs so none of these DLCs can add non-Asian Argon NPCs to the game.
Can you help me?

I'm new to modding X games.