On the topic of the nose bridge seal, I would like to propose this idea: taping a pre-cut twist tie across the bridge. Disposable PPE masks often have some malleable wire along the bridge that allow the mask to be flatten against the face by the user. We can easily emulate that with the same twist ties we use to close bags. Taping down its center and ends keeps it flush against the mask. I tried it myself, and it greatly reduced airflow up into my eyes. Using pre-cut twist ties would make this a very easy to implement solution, but thicker wire that is usually sold on spools could also be used for the same affect.