I have not been to a track that doesn’t require and overflow can. I have run closed end lug nuts forever, but always on a steel wheel. If you have sufficient engagement they might make you pull off a nut to show it. I have a loop, never had someone look for it.
I’ve raced at 2 tracks and never been called on no overflow. KCIR and heartland in Topeka. I’ll bring a bottle and zip ties just in case. I’m on street tires and steel wheels. I doubt I’ll get much flack.
