If you are able to see up Calibre to manage your eBook library, you can set it up to sync your library to your kobo. I followed this guide when I set it up for my wife. It does mess up the shop on the device, but our way enough to get DRM free ebooks elsewhere and just sync it to the kobo
You can also set it up to only sync certain "bookshelves’ if you share a library or don’t want to look at all the books on your kobo all the time