Of course Bruce could be a self made "man", in terms of "Batman". If he himself comes up with the idea that he must be more than a man, if he himself comes up with the idea that he must frighten criminals and become a symbol...and if he himself seeks out the training/knowledge to do so. BATMAN BEGINS works, but the nature of Bruce's origins is not nearly as compelling as whats in the comics, which Nolan and Goyer drew heavily from to begin with. Much of the good stuff in the origin is drawn right out of the comic book mythology.
Changed how?
How does FIRST CLASS evidence this? It has a villain every bit as thin as other comic book movies have had, the characters are mostly cyphers, except for Charles and Erik, which is to be expected, but even then, there's no great exploration of their concepts. The reason its a period film is that its largely held over from an abandoned X-MEN ORIGINS: MAGNETO script, one that existed before THE DARK KNIGHT was even written.