Mogrim, sorry I am a simpleton with IT stuff so I don’t actually understand your suggestion
My fault, as a fully paid up IT worker I’m not always as clear as I could be 🙂
Basically you can install apps which allow you to check out and open the files on your device, the same way you do on a normal computer (on Windows, for example: open My Documents folder, then double click on a Word document to open it.)
You would copy the books over from your computer to a folder on the Nexus, then using the app you would “click” (touch with your finger) the file – at which point the Kindle app should automatically open it. (Or if not Kindle, Google Books or whatever).