I haven’t yet. Maybe I could… but USAC rules say 10 starts. Right now I have 8 crits and a fondo. Maybe I can find another fondo in the next couple of weeks and upgrade to 4 before the classic.
I think I’ll be fine in terms of competing in the 4s as well. Unfortunately every 4/5 or 3/4/5 race I’ve done has been less than 30 minutes turnaround from the prior 5 race, but if I was fresh I have no doubt I’d compete in most of those races.