I made a KUAL extension (I'm on PW so I don't know if it works for others).
Leafpad Required !! (to edit the config : If you don't have then modify with computer or prefered notepad on kindle)
Instructions :
-Copy it like usual in /mnt/us/extensions
-open KUAl and choose the "Edit config" option
-Modify the Secret to match with your computer
-reopen KUAL and start the sync
Download here