You should be OK with generic font-family:sans-serif statements. I believe the built-in Avenir font is used for those. Just avoid font-family:"my font" options for an easy life.
Caveat: If you need a generic font-family:monospace option for portions of a book you need a slightly different approach as Kobo doesn't include a monospace font. There is a fairly simple solution applied via calibre should you need it.
Re: the is Default Document the same as the 'real' Kobo Georgia, I'm not sure. The real Georgia allows the Advanced thickness setting but the Default Document font choice doesn't.
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