Depending on the captains level of EK induced paranoia, what you're asking for may be (*very* strictly speaking) against the rules. Having said that, many of the captains are more than happy to entertain visitors at the end of the flight. Perhaps just speak with the Purser during boarding or inflight and he or she can co-ordinate. Can I just suggest that you ask before taking photos, and don't be offended if the crew decline. As for visits DURING the flight... not a snowballs in Dubai!!
Hope you enjoy the flight.