Where I come from the Pinewood Derby race is only for cub scouts.
True, the “Official” derby is. However, there are still many dads who are still Cubs at heart and having an “open” class is fun and helps to build comraderie and friendships.
Run the Cubs’ cars first, for the “Official” race and then have your open races. Nothing wrong with that.
Besides, I don’t know if this track even meets the official criteria, but it would be fun nonetheless.