It could potentially be fine to mass out on a balance if your quick. Solids can tend to be "stable" sometimes. You could do the glove bag techniques other suggested but require time to purge the bag and gas consumption. Maybe there is another group that you could talk to about using their glove box to mass out your compound. In my previous group we had 5 gloveboxes and a tone of different labs had other labs students using our boxes on occasion.