Just answering to close out the question, but if anyone has other opinions please chime in.
No, it’s not possible to use % signs in post permalinks without some very hackish workarounds. It’s also not advisable given they are used in URLs as special characters. That said, the lack of % symbols in the permalink should not adversely affect SEO as Google and other search engines will already be filtering them out. If you want, edit the post-permalink/slug to use “percent” instead, which Google will understand.
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