> - nobody would let Iran to come even close to remilitarizing again. No centrifuges, and no placing them or anything similar under ground, etc.

How would they enforce that? It is underground, they can't exactly monitor what is down there with satellite photos. There'd need to be something like a blanket ban on underground mining across the whole of Iran and probably a country-wide occupation to enforce the ban. Otherwise it seems quite difficult to identify where the hypothetical centrifuges are.