Hahaha. Yeah, this is what I've been using for the games that have been blacked out this year. I just google exactly what you said, it's usually the first link that comes up. Select a stream, close out of the popups, and you're usually good to go.
I watched all of the World Cup this way as well. Maybe one day the NFL will make it truly accessible and affordable to watch games on demand. Until then, I have no qualms about finding back channels to watch what I want.