How does the NAS solution work for you as looking for one myself? Looking at not just documents but media files too.
I use a WD MyCloud 4TB NAS. Albeit it works, it has several limitations and the iOS app is not the best. For example there are no full administrative functions within the iOS app, one has to use the web interface from Safari which is slow and definitely not designed for touch screen. It synchronizes only with Elephant drive (of which iOS app is not good, e.g. it cannot created folders...), Amazon S3 and it also has a Dropbox sync app. I use this latter and it seems to be working.
So, if you are looking for a NAS, I highly recommend rather a Synology NAS, which has a better OS, more options and overall it is better made.
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I use a Smart Keyboard. It's just the highlighting the text part that I find the most fustrating.
Ah, see. I am highlighting texts with my fingers or a stylus on the touchscreen. I find it way more intuitive than the mouse method, but it is just a personal preference.