Embedded fonts are more reliable than user added separate fonts. You do need KF8, they seem to work on all Kindles that have a "Publisher" option on Aa, without any patch. Kindle Keyboard 3.4.something to PW 5.12.etc. Dual mobi or AZW files. You have to select the option in Aa. Only Mobi files that are really dual mobi (KF8) will allow extra fonts.
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