I'm not ready to give up on you yet, Jim.
I've attached a zip file containing 3 items:
- test source in raw HTML
- Extra CSS I used
- the converted EPUB
The EPUB definitely displays in Georgia on my PRS505.
Just drag-drop it to your PRS600 and view it. It does not have the fonts embedded in it, just the pointers to the fonts on your reader memory.
If the EPUB doesn't work then either customised fonts doesn't work on the PRS600 or the fonts are not correctly referenced. Check your spellings, don't forget that the file and path names are case-sensitive,
i.e. Data/Fonts/georgia.ttf is not the same as Data/fonts/georgia.ttf.
If the EPUB
does work then your reader is obviously capable and your source ebook needs examining. You can look at my raw HTML. I do not have any styling whatsoever in there, i.e. no references to font.
Perhaps you could post your test source.