I just tried a ziplock bag. It messes up the infrared light path and creates false touches. That plastic bag idea did not work for the kindle touch, but should be fine for non-touch kindles. You would need a stiff clear plastic cover over the front of the K5 before putting it in the bag, in which case a non-touch solution would be needed, like you are looking for. Perhaps some kind of "pulse code" presses on the K5 Home button (simpler than Morse code)?
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