I've seen a couple of bikes with "00" on them. Just like Jim Otto, former center for the Oakland Raiders. He got the league to allow him to wear the 00. Back to the original question, if you go with one zero, get a big, wide number so you don't have a lot of blank background. JMHO!:)
Go with 00. There was a ol'e farmer that raced at a track I frequented in the mid 80's. His number was 00. I always thought it was cool and unique and the same time. Dennis Kirk sells jumbo sized numbers.