Jane,
Some of the "embedding fonts" discussions are not about putting fonts into the ebook output file.
Many of these discussions are about users wanting to add fonts to a hardware ereader and/or change the formatting of ebooks to use a particular font or layout (margins, paragraph spacing, etc). Mostly this consists of placing the font on the ereader and changing the CSS stylesheet to account for the desired changes. I believe these were universal changes to the ereader hardware that affected all books on that device.
From your request, I don't think this is what you are looking to do. Most likely Kovid's answer is going to be the most correct for your purposes.
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