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I've never seen anything like that. It should not be too hard to fab a screen cover using soft screen wedged between the bars. Probably could be made to look pretty good.
Us early Mustangers use a plexiglass cover over the cowl grills. It is lined with weatherstrip on the bottom to protect the paint and is secured with spring-loaded "T"s to hold in position. I can drive with it on but that's where the heating/ac system gets its fresh air.