So you can't affect your first character with a new word state?
Once you make the character that specific word state can not be affected by creating a new character or using the keep, it's "locked" to that character, yes?
I can confirm this. You are safe. The game takes the currently loaded world state on import and loads the variables once that character is created. It's set in stone from that point on.
I rerolled last night with a new imported world state. Afterward I went back to my other character. Her world state is fine. If you think about it from a system point of view: to be able to change a world state while a game was in progress would essentially break the game and open up so many levels of complexity **** would go haywire. This basically could happen in DA:O on PC with the save game editor. If you ever tried to use it, it came with about 10 warnings on how you could destroy a save file / corrupt it.
Example:
Character X is alive and well in your game. You meet them.
You edit your world save so that Character X died.
Load up game with now dead Character X. But what if you had a quest from Character X or something?
It's like a butterfly effect. Codex's would have to rewrite themselves. Character dialogue trees and cameos would need to adjust. Things would go haywire 