I was hoping this would work on the "Regional Indicator Symbols" used for flag emoji, since they encode the same country codes used in ccTLDs.

🇩🇪 is actually two Unicode code points 🇩 (U+1F1E9 'REGIONAL INDICATOR SYMBOL LETTER D') 🇪 (U+1F1EA 'REGIONAL INDICATOR SYMBOL LETTER E') that fonts display as a single flag grapheme. But google.🇩🇪 becomes the Punycode google.xn--h77hc and fails to resolve rather than mapping to ASCII as these other characters do.