I see. Maybe improving the partitioning and cloning process (i.e.porting gparted, writing some GUI wizard to run tar) would solve this too and benefit also others. But I see advantages of simply copying couple of random images to mmc and booting and testing them without any hassle. But can you make such image downloadable without copying some nokia proprietary stuff you have no right to re-distribute?

Anyway, I will look into it and see how complex it really is and what breaks in which ways with the FAT partition being locked by the image.