Anything that makes it *more* brick proof would be a sensible recommendation to install. It costs very little to install the rescue pack, considering the value it adds. Most hacks that I have experience with, eg Luma on 3DS, Bootmii on Wii, have low level menu's to try and deal with recovering from bricks. Admittedly, the Kindle is pretty hard to brick until you start messing with the internals, but it seems like a surefire way to guarantee JB restoration in the future.
/rant
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