This is almost what I was hoping for. Completely made of silicone, no plastic, small protective edge. It is tight both vertically (the license plate fits but needs to be inserted carefully and on the last few millimeters with a hammer) and horizontally. I've attached a photo to show the latter, you can see my license plate sticking out from the side, it's actually in the middle and pulling down on either side, but I couldn't capture that in the photo. I think it should be 5mm longer.
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