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You can specify a font in CSS and not embed it. You can't use CSS to say where it is if it's not embedded.
A referenced font in CSS but not embedded will work if "Publisher" font is selected and the font is already on the ereader. The kobo and some kindles allow adding fonts to the system. I've never done that, so I can't advise, but the font adding rules are specific or it doesn't work.
Asian fonts might add a lot of storage per ebook, but a subsetted Latin-Roman (or other Western), Hebrew, Arabic, Greek or Cyrillic font embedded won't take much space. Calibre conversion (or Editor) can subset font(s).
I usually embed Georgia, but it's likely not exactly the same Georgia as on a Kobo. Not all ereaders have it. The older Kindles and many apps ignore embedded fonts. Older kindles and some apps will only display fonts installed by Amazon Firmware or the App programmer.
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