Michael Savage has been saying for years that they should just take the whole thing out right on the launch pad while all the dignitaries are there picking their noses.
It could be done. I would think that they could outsource it to the crack Israeli commandoes to go in and destroy it on on the pad at night with high explosives, as their own practice for future actions on Iran. In fact this might be more of an Iranian missile test launch outsourced to DPRK than anything else. Israel and Mossad should be very, very interested in these developments and results.