Yes that could be a way, I dunno why the ziploc bag, if you are always with the gloves you wouldn't be able to leave your fingerprints.
In a really shitty situation you also should consider pictures and video. In most public demonstrations you'll have other people taking pictures, the media filming and taking pictures, CCTV from the government and also many times I have seen snipers and photographers on top of the buildings, so being a "grey man" is key, and having something to cover your face that is easy to hide or throw away.