“If you do go out and get flight training elsewhere, then I highly recommend building your experience from elsewhere. Learn to work your way up, fly some turboprops, and regional flying. It will be a much more rewarding career than going straight to cruise relief on a long haul wide body. Some guys at CX have never done this, and they have missed out on the fun.”
This is a critical point! You don’t just miss out on fun but also vital handling skills that you will NOT get at CX. Long haul flying is something to be done at the end of your career, not the beginning. But why listen to an old guy? You teens and twenty somethings know everything, right?!?!