Hi Euclid,
this is not exactly what you want, but while we wait for somebody more expert than me to give you advice, one way around it is to use Calibre2OPDS with Dropbox. You put your Calibrelibrary on your dropbox account, you generate a catalogue of your Calibre library with Calibre2OPDS, you access the catalogue from your internet connection, and download the book you want.
The problem is that Dropbox cannot be on a mobile media. However there is an application for that (which I have not tested yet) that should allow you to put dropbox on the SD card: one is here (but I suspect that it would also install teh programme), the other one
here.
Should you feel like using Dropbox, you can use the link in my signature