While I’ve never been in that bad of a wind/sand environment, how about a “Darkroom Changing Bag”? In the 70’s & 80’s, I got it as I developed my own film and needed this to transfer the film from the film cassettes to the developing containers. I still have it and use it when I’m headed to the ocean or other windy situations. I bring it for those unusual situations when I have to separate the lens from the body or to clean a filter or lens, or an add a filter…. Cheap and convenient insurance.