Question: Greek Characters in Bitmap Plot Devices

This is inspired by MapleTA, but applies to Maple in general.  According to the documentation, bitmap plot devices do not allow for font selection, meaning the recommended textplot(...,font=[SYMBOL]) fails to render greek characters such as π in plots which are rendered for embedding in web pages.  This seems like a gaping omission, so we're hoping we've just missed something here.  Is there any way to get the symbol for pi onto a jpeg or gif plot?

Allegedly, exporting an entire worksheet to HTML using the GUI can accomplish this, but this seems an awkward method in general and is entirely unusable for us in MapleTA or in scripted desktop environments.  What gives?  Has anybody encountered any clever workarounds?

Thanks in advance for any suggestions...

Phil