I’ve been looking around veyhwhere trying to find a solution. There should be one! You should be able to decide who is is who’s league. My only real sugestion if you want to be in it ( I want you to be in it), is to make a new acount and start off as a rookie. I have changed the settings so there is no promotion or relegation, so no rookie or pro.
However this would be unfair to you as you have already built up your team and have drivers. I will look around again and see if I can do something. :-/
Welcome to the league Andy!