I agree. I doubt we can imagine all the possibilities
There was a show on “paint on” TV screens. I forget how, but electro-sensitive bits were added to a VERY thin film of plastic. The plastic was flexible and still showed the picture. They then spoke of imbedding it into paints and covering entire buildings, walls, etc. with it. So - add it to this spray on glass. (Or cover the building with the electro-paint and THEN cover with the glass).