It should remain stable for a good long while in vinegar solution. You wouldnt need a pipette at that dilution. For instance if your usual dose is 250 mg 3.333 grams diluted to 200 ml with vinegar would yield 250 mg per tablespoon (15 ml).
Many security types are suspicious of liquids, especially in the US and its minions. If you do it, put it in a herbal vinegar bottle and tell any security you use it with water as a gargle for a thrush infection in your throat

A tablespoon of herbal vinegar diluted to 1/4 cup is a standard treatment for thrush so a measuring tablespoon rubber banded to the side would seem innocent.
I would personally make it into pills. Go to health food store, get empty gel caps and some cheap and innocent herb supplement in an appropriate size bottle. Use the emptied bottle for the harmala pills. Also get powdered sugar to use as a filler. You could swallow the pill or dissolve in liquid.
If you have any muscle at all you could make a drink mix from it and put it in a pre-workout supplement jar. Just make sure to wash the jar first!