I feel like - as with his Golden Age comic counterpart - it'll take introducing Robin into his life to fully bring Bruce Wayne out as his own distinct character, as well as solidify his turn from 'Vengeance' towards a slightly lighter (and not at all campy) Caped Crusader. We already see him empathizing so hard with the mayor's son in this film, so him adopting Dick Grayson won't be that much of a stretch. There are still circuses in America, believe it or not, so the comic origin can be used. And yes, it does need to be a pre-teen Robin this time - the closer to the age Bruce was when his parents died, the better.