Why subject your bees to ineffective treatments? FGMO has enough research on it that proves is is hardly effective. It was all the rage a number of years ago but that faded fast and I don't know any successful beeks that use it anymore. Mineral oil, IMHO, is no more natural than Thymol or Formic. And I wouldn't want my honey to have mineral oil in it so, if you must have supers on, Formic and Hopguard are about your only bet other than sugar drops which, again, are not proven to help that much. If your supers are on and you don't want to use Formic or Hopguard then hit them with sugar until those supers come off and you can use a truly effective treatment.
Raising Vermont Bees one mistake at a time.
USDA Zone 5A