[PeterT]

Simplest approach would be just copy the .kobo directory structure from your device to the folder you want to use for the Connect to folder location. (In reality you don't need the entire .kobo; just .kobo/version and .kobo/KoboReader.sqlite)

The only thing which might appear strange is that after sending content to the folder, it will (on the next connection) not show the books as being on the device, due to their not having been loaded into the Kobo database.

And yes, calibre will follow whatever options you have set the Kobo driver to as far as what formats will be sent.

In fact, you've shown me a new way of saving kEpub formats to my Google Drive/Rakuten Kobo folder for access from the device.