On the bench is exactly where he would be though.everytime I read someone wanting Billy in another universe I wonder if they get that he would be lost in the deck of characters only used for multiverse type stories,and not every month,which we are getting now.DC is not gonna break up the DCU into multiple different universes,they publish almost exclusively earth 1 stories,not 1 from each earth that us fans would think a character would fit better.
Having Billy keep his mind as a kid is his niche (besides magic of course) to differ from superman,that's also what makes him not the top dog,but it also better than that gives him the ability to be way more fun.