Maybe you could try adding shell script code to rename those 2 ota files ( = undo the rename) back to original names into file named "emergency.sh" and copy it to top level of exported Kindle drive over USB cable? And then force a reboot by holding the power button on Kindle for >15 seconds.
I'm not sure what would be the state of the "bridge" Upstart job after doing a factory reset on device with firmware 5.17.1 or newer. If it still runs that job it should check for the existence of "/mnt/us/emergency.sh" and execute any code you put there.
What did you use originally to rename ota binaries? KUAL extension "renameotabin" or @Marek's "scriptlet" from Discord severe or that thing that does both OTA rename and disables sending logs to Amazon?
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