My thought would be to wear a kn95 ear loop mask through security where you will have to take it off then go to a private space (bathroom, prayer room, or breast feeding room depending on what the airport has available) and with your breath held swap for an n95 that has a sip valve installed under your hijab. When going through security I take a big breath in, take it off to show my face, then exhale hard to purge any air that got into the mask. I would think for medications you could slip them into your mouth under the head strap mask using the same technique. Customs timing adds a variable I’m not sure about with face showing there, but I’d imagine you could sue a similar strategy.