Well, ###. You have now come up with the only reason on the planet that would make me consider moving to an OS that doesn't permit Rosetta ;)
Although even then, there must be something you can do with a third-party emulator right?
Wonder if 10.7 or 8 speak Bengali? I always thought it bizarre that they can do Devanagari (also Gujarati, Punjabi etc) but not Bengali although the scripts work identically, they're just slightly different letterforms.