I've never seen one, and I've looked. However, it seems stupid to me that nobody's stuck a standard welding-style LCD filter over a mirror. It's about $20 of parts and the LCD has adjustable darkness from 0 down to #12, which I can't convert into optical density off the top of my head but it's about 1:100, far more than you'd need. Setting it up with a light sensor so it'd auto-darken at night, would be $25.
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However, it seems stupid to me that nobody's stuck a standard welding-style LCD filter over a mirror. It's about $20 of parts and the LCD has adjustable darkness from 0 down to #12, which I can't convert into optical density off the top of my head but it's about 1:100, far more than you'd need. Setting it up with a light sensor so it'd auto-darken at night, would be $25.