The device supports unicode already and its the font that they are shipping missing the glyphs that you want. (I know minor difference but everyone seems to forget the difference between supporting unicode and the glyphs required to display the characters)
Obviously its possible to hack the device and replace the font, just remember that font itself is a copyrighted work, and Microsoft didn't spends years + tons of money to make a font for you to use it in the Kindle =D
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