Greece is in the opposite direction from Iran, so that would make the flight even longer, and would still require them to fly over either Turkey, Saudi Arabia or Jordan and Iraq - I don't see the benefit to your idea.
While this putative "attack" is underway, 15 or twenty missiles a day would be on their 15 minute ride to Israel's major population centers. "Attacking Iran" is the 21st Century equivalent of the Allied attack on Germany. It is not some Air Force operation that will be over in a week.
The place to be based for an air attack on Iran is Afghanistan or Turkmenstan, or Azerbaijan. Israel has no bases there. We do. But that could still be a 3,000 mile round trip for some missions in NW Iran. That's work for aerially refueled B-1, B-2, and B 52 squadrons, which Israel does not possess.
Attack Iran? Not bloody likely by anyone because it would be an all-out effort requiring Ground, Air, and Naval Forces, in addition to ICBM's and Cruise Missiles by the hundreds. The Iranian Shiites would be happy to sacrifice a million KIA. We are not.