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From what I can tell, it might not be as easy as just changing the version number. I spent very little time on this, but I took a look inside the .bin files using igorsk's tools. From what I can tell those contain binary patch files that change certain bytes in already present files, they do not contain the whole new file versions. Therefore, I don't think that re-patching will work, since the diff process that verifies the file to be patched will fail.
The only way, in my opinion, to do this is somehow restore the original Kindle firmware. Hopefully it's somewhere on a readonly partition in the Kindle OS. Unfortunately, I myself cannot check it.
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