I'm sure humidifiers are made for commercial equipment. However, it's unlikely that the building owners would go the expense.
Vaporizer is good, and encourage others in the area to also vaporize. Better than nothing. Depending on how hard the fans blow air through your cube, it may be a big help for you. You can also "borrow" a side partition from one of the empty cubes to make a ceiling for your cube. Dilbert did that kind of thing. Or, on occasion you can tent yourself in with your humidifier by using a towel. Explain to others that it's on doctors orders. Or, you can wrap your face in a wet towel, and explain that it's a burkah. Failing that, you can pour water on the carpet every morning. Or you can import live plants, and water them generously every day (where do you think all that water goes? Into the air!). Get a couple trigger spray bottles, and have water fights.