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You only "distribute" epub to Amazon. You upload an epub to KDP.
Use Calibre to subset the fonts. Import Docx to Calibre. Obviously you can use Sigil if you are needing a more custom approach.
If the customer's Kindle or app can't do KF8 or KFX they get a KF7 format file without fonts. The KF8 and KFX are almost just epub with a wrapper and optionally DRM on KF8 and always DRM on KFX (even if you asked for DRM free).
Font obfuscation doesn't work on some epub ereaders and may not work at all with Amazon. Sub-setting a font is the desired solution.
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