Almost every other sport in the world does it, yet it "wouldn't work" in NRL because????
It makes 100% sense to do. People saying it would be confusing, like seriously have you never watched a sport that's not the NRL?
But to make things simpler, they can limit the selection of numbers between 1-30 for players within the top 30 (with players outside the top 30 having to select numbers as per ascending order). Players have their names on jerseys & can choose numbers that mean something to them, or it can be used as a mark of seniority in the club (similar to how the 10 is used in football). As players become more important and senior, their number increased e.g. the back up half who was previously the number 17 becomes the 7.