The Kindle Fires would be fine. The most you would have to do is flash a recovery, and then flash the latest Kindle update to them which automatically removes the recovery. However, if they are demos, they might not have actual serials. In that case, flashing CyanogenMod would be a great alternative as it makes the KF a full fledge Android tablet which then pretty much runs anything you throw at it that doesn't need a camera or microphone.
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