Well - I simply don't know if the user partition is important or not on demo Kindles. I also doubt it, but you never know. Making a backup of the full disk image is simply the most conservative (literally!) option, because it's a bit-identical copy.
BTW, once you have everything together, please send me a PM so I can grab a copy of the files. I'd be interested in taking a look at them, if only to see how they differ from the production ones.
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