It is OK to cheat as long as you go to confession afterwards
There are kids on every single 2020 team in town who have 2001 birthdays prior to Sept 1. There are rising 9th graders in every single school in town who have 2001 birthdays prior to Sept 1. Most kids are classed appropriately and I don't think that most folks have any problem at all with a kid who is a few days or months older than the cut off date. This is not what anyone considers an advantage. Summer 2001 birthdays are not "cheating" and, quite frankly, I don't really get nervous when my kid's 2020 team plays against a team that has a dozen holdbacks and a few double holdbacks because I have confidence in my kid and his teammates to bring it.
Why does all of this make you so nervous?