I think that it doesn't matter what you have your character named as since you can only have one character right now anyways although idk how the double XP works now that we are on the whole per skill level system.
Have the Devs even said there would be some kind of double exp in R23? I think it's a hard call to make. On the one hand, getting double exp distorts the levelling up experience markedly, so there will be no realistic feedback on the skills levelling mechanics. On the other hand, the Devs want players to be able to explore all regions and not be stuck in beginner areas for the duration of the build.