Just an idea of course, know that people want to play it. But there seems te be an arguement about firered kanto vs johto's kanto  Can it be done in reverse? That after completing kanto you get a script with Oak that introduces you to prof elm which gives johto access (with HG SS safari?(gible)) johto has a portside town as well so players might get a johto ticket(like when you can get to battle frontier in Emerald) and take the boat to olivine. (Ofcourse after beating kanto e4)