The fact of the matter is, EK can't register EVERY SINGLE PERSON that attends an OD - it's simply too much information to hold. There have been people on this forum that got the job without waiting 6 months so that's proof you can get through without waiting.
HOWEVER, this doesn't mean I encourage it. They can still catch you...your recruiter may remember you, or they might find out when they process your application in Dubai. And what are the consequences? You obviously won't pass, and you could even be blacklisted for life. So is it worth the risk? Personally I don't think so. I think we should respect the rule, but like anything in life, gamble at your own risk.