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Don’t suppose there’s been any update on this? In the same boat.
The only close solution I can find is detecting if a font is installed, not detecting if a glyph is missing.
If you want a good indication if a special character is missing visually, you can set the next fallback to serif if you’re using a fancy sans-serif font. E.g:
font-family: "totally-fancy-sans-font", serif;
The missing characters will stick out like a sore thumb.