Born 90 years ago and still going to work!? .. oh, in the 20s, not from them.... Clearly not officially permissible modifications, but they run the league and they make the rules--its a low key we-all-go-to-work-tomorrow league with players from the 20s to the 60s.)
But also, if none of the people involved are registering with a local association, none of them care what IFAB or FIFA think, because they're not under any such control.