Maybe you should ask xda-developers for tipps on how to extract files from a flash-file. The start would be to optain the right symbian driver files. Some people from the Pocket PC scene may have information too, like the people behind tcpmp/coreplayer and fpsece, because they optimized their software for the 2700g (MBX-lite).

The openpandora people may have information ,too. I think they have access to the drivers for the newer sgx. Maybe they can give hints without violating NDA, just tipps where to start.