A few deprecated characters, including the Kelvin and Ångström symbols, are in fact canonically equivalent to their replacements and not just compatibility equivalent, so plain NFC/NFD is enough. (It’s generally better to avoid NFKC/NFKD normalizations unless you fully understand the implications, as they do lose meaning and at the same time do not account for all possible confusables.)
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A few deprecated characters, including the Kelvin and Ångström symbols, are in fact canonically equivalent to their replacements and not just compatibility equivalent, so plain NFC/NFD is enough. (It’s generally better to avoid NFKC/NFKD normalizations unless you fully understand the implications, as they do lose meaning and at the same time do not account for all possible confusables.)