The executable contains lists of the short strings used to create the accents. For example, one list contains all the variations on "can't you" used by the various characters. There are a bunch of unknown bytes packed around the lists that presumably map each variation to the characters who use it. From there, all you need is a simple substitution function, with special characters for the text you want to change:
Hey, {can't you} see it?
(Select character Korcha and substitute in) -> Hey, can'tCHA see it?
(Select Norris instead) -> Hey, can't you see it?