Isn't it already too late for that? Israel had their chance and let it go by. Short of making the entire country of Iran into a glass parking lot, Iran's nuke program is probably so far underground now that no regular military attack can destroy it. Hell, it's so far hidden now that no "inspectors" will be able to find it. Only the decoy sites will be available for inspections.
Here we go again ....with those sham UN inspections, ala a replay of Saddam's 'hide and go seek'.
You said, “Iran’s nuke program is probably so far underground now that no regular military attack can destroy it.”
They have to get air and food into them somehow. Besides that, they have to get the nukes out of there as well. I see it much like watching and ant farm. Kill the ingress and egress points and the whole mound dies.
It is the simple things that work best. How do you kill a fire ant mound? Sprinkle a little bit of non-instant grits around the mound. Make sure not to sprinkle on it and let nature take its course. The drones will carry it to the food supply for the queen. Her eating it along with her court makes them explode when the water in their system gets to the just eaten grits.