Adding league not in the game to a save

I have just been offered the Saudi Arabia job in my save and accepted, however the squad consists of horrible gray players and a few crappy <20 year olds.

I then went to the add/remove league screen but the Saudi Arabia league does not come with the game, there are however custom Saudi Arabia leagues in the Editor's Hideaway, but they don't show up in-game either

Is there any way I can add these custom leagues to my already in-progress save or at least load players from Saudi Arabia into my game, or am I doomed to keep fielding all these terrible players and losing every single match?

That's not possible, you need to load a custom league file when you start a new save, otherwise the game does not recognise it. The same with additional players.

Bummer, I guess the only thing left to do is resign then

Hopefully SI manages to implement this feature for 2013