I originally bought this DisplayLink-capable “mobile docking station” for my work laptop, and found out that it supports Android phones, too, including FP2. So I installed DisplayLink Desktop app and got myself a USB-OTG cable, and BOOM - I can now have HDMI output, and even better, when I plug my Logitech Unifying receiver in it, also a keyboard and a mouse!
So, could DisplayLink replace MHL in your use cases? In my case, it really did, and more!