I do not know about 505, but I have been using embedded Polish fonts on 500 without any problems (I do not like the default ones too much).
You just have to add the fonts in the "Make eBooks/Sony Reader/styles/external fonts, then define your styles with them.
The embedded fonts supposedly slow down the page turns, but I do not see it as a big problem. The nicer fonts definitely make up for that.
By the way, it is hard to believe that in the 21st century they have designed a device without Unicode support. This is a real showstopper in multilanguage texts - for example in a Polish book with Spanish or French quotes the characters are badly messed up...
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