Well this comes a few years late, but what i would do, is fill a plastic bag with nitrogen, stick my hands in really fast and close the cap and lid of the oil, think that would do the trick if you were really keen to keep the top notes of the oil.
The whole trying to spray gas into a 3ml btl is just asking for trouble, i feel.
The whole trying to spray gas into a 3ml btl is just asking for trouble, i feel.