The overwhelming majority of people don't care about online leaderboards in this game. That's based on the last year or so of feedback across multiple threads, feedback and being a pretty active online player myself. They're irrelevant. Online is crazy good in DBC when it works smoothly, it's a near-perfect execution of what online gameplay should be for cricket - online saves being the golden benchmark.
The massive stand-out flaw was the entire offline game was built around online leaderboards being "fair" which was silly, cause it was never going to happen. So you ended up with the career mode being hampered in service of an online leaderboard nobody bothered with.
Should simply be an opt-in/opt-out button for the user and that takes care of it. No need for an overally complex system whatsoever.