@PackElend I just stumbled over some new hurds, my display suffers ghost touches and dead zones. But I came to test several things.
As @ChuckMorris stated, those two are somewhat dead.
But I can confirm, that it is easily possible to connect it with an HDMI dongle (e.g. this cheap one called anycast in MiraCast mode (WiFi on, then screen cast, maybe a problem when you need WiFi for internet, not sure though, you would need to Google that one, since a only use 3G/4G).
There is a lag though. So, it was ok to write a text, but mouse lag is somewhat annoying. ChuckMorris nailed it quite in a previous post. It is ok, for text writing only even quite good in my eyes, but as soon as you want to do serious work, you get slowed down by the lag.
Further I tested the already mentioned Targus DisplayLink docking station. That one is amazing considering the options and performance. I powered the targus with a micro USB cable, otherwise you can watch the battery drain on the Fairphone. But still, you need around 500-700 mA to keep the battery level on a fully dimmed Fairphone display. There was no visible lag whatever I tried. Youtube videos, writing, surfing, so that one is definitely the way to go. Together with Sentio Desktop a somewhat Netbook. Even though the apps are not yet developed enough. Meaning the browser doesn’t allow zoom. So I preferred Chrome. The Text-Editor is too simple for real stuff. So I used Word.
Keyboard and Mice were connected by Bluetooth, no problem there at all.
Conclusion: Wireless ok for simple stuff.
Wired: Fully useable simple netbook. Software not yet ready, Sentio ok as a start, maybe this will get enhanced in the future. Otherwise you can allow the Google Now Launcher to rotate the Home screen. Then you can easily work with Chrome when used in Desktop View. Word worked nicely as normal app as well.
So far I’m not sure what to do. The display problem is a bummer. I either look for an USB-C phone, which should take away the power problem, or I try to solve the power problem differently (see here).