Since I notice you're also including gender choices, I'll just mention that most people do not do this. Readers are used to set characters, like in a novel, and don't really consider gender choices a required thing here like in some other places. Since the editor isn't really designed with that in mind, unless it significantly changes the plot somehow it can represent a lot of tedium for you as an the author that might be better spent fleshing the character out in other ways.
That said, if you want to do it anyways, On Page Scripting will let you swap pronouns around in the text according to variables, and might save you a lot of copy and pasting and from being perceived as padding out the length of the story that way. (
https://chooseyourstory.com/help/articles/article.aspx?ArticleId=3850)