Nope
If I actually found out, In Character, that your Secret Retreat was on Luna, I wouldn't even wait for them to evacuate the planetoid - I would sterilize it immediately.
Unvenilei, I recommend you do not break up Luna. It would be best if it remained a stable planetoid in orbit around Oerth. Perhaps, later, it could be terraformed in to a stable habitat. After all, it has no atmosphere to hold radiation and toxins, so once it cooled, it would be usable for raw materials. Besides, if you dissolve it to haze, that haze will fall to Oerth and cause even MORE dusty ecological damage.