I thought the same thing and decided to make a few from clear plastic drinks bottles which I cut out and glued together. I used them for about 6 months but gave up - I noticed that my hats didn't wear away at the very thin plastic so they obviously weren't in risk of keyholing so I didn't see the point (they were also fiddly and a major pain). Maybe its because hi hats are generally mounted pretty flat so there is little offset weight causing wear on one side of the hole, unlike cymbals and rides which tend to be angled (unless you are a fashion victim).
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