FlyDubai is nice and good. B737 maybe a (quick) Command. But not really having flights to S. America.. Plus I don’t know about the rosters but for sure you’ll be working your a** off.
From what you say, I might have to say that Air Japan is a good option. 2 weeks on, 2 weeks off. Business class with ANA back home. At the moment joining on B767 but later you can switch to B787. Commands are going as well.
Good luck! Unfortunately all companies want these kind of test and exams..
wish you all the best