Woot. My rclone solution from Kobo to local storage, then calibre connect to folder, eject from calibre and rclone back to Kobo worked perfectly.
Now to clean up the content I've loaded wirelessly to get all organized in the Kobo
Now of course that darned double connect need of the Kobo will be a PITA with this scheme but it's a minor price to pay.
Many thanks @kovid for implementing this. I can see it be handy for those who want to develop / maintain plugins that deal with content on the device without having to plug / unplug their devices.
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