Let me try to cut your search to a minimum by telling how I have gotten it to work so far. Please keep in mind that I have not watched more than a few preseason games but I managed to watch both live and archived games.
My setup is as follow YMMV but this setup works for me so far.
First you need to get a fast/reliable VPN I use vypervpn from giganews - setup your PC to connect through a U.K. server.
Then your gonna need to setup Plex media server on the same PC and setup your roku with the Plex channel and then from your roku
Install the NFL channel now your going to need to find/crack/buy a U.K. NFL gamepass account (this probably can be from any country other than USA, just be sure that your VPN access is for the same region)
Okay, now with your VPN running your Plex server will route the traffic between the pc and roku without the need to change the DNS at the router level. Fire up the big screen load the NFL Plex channel up through roku logon and enjoy cheap/free NFL!!
