This is probably asking a lot, but is there any chance of somehow running this on Chrome/Chrome OS? A Chromebook with Trelby (saving to Google Drive) would be a pretty awesome writing machine. Especially with the Samsung ARM version. 6+ hours of battery life, light weight, a good keyboard, etc. for $250.
I really wouldn't know how you would do this, but I guess Native Client or possibly Pyjamas could be used?
If not I think I may be able to boot a full Linux distro from an SD card to achieve basically the same thing.