Place embedded pdf Link with Option to Convert all text as outlines
When opening a pdf in illustrator, if the pdf contains fonts that are not installed on the system. it will ask to find the font. and substitute a system default. the vector data for that font is in the pdf. if you take the same pdf, place it as a link, then flatten transparency, you can select "Convert all text to outlines", I would like the option to select "Convert all text to outlines" when embedding a placed PDF, so all fonts will be outlines and show properly even if font is not shown. it would use pdf font data to outline.
Related to this:
Convert text to outlines on open