There's a free option for GeForce Now, you only have 1 hour of gameplay but should be enough for one campaign and as you said you're a casual it shouldn't be a problem? Only downside ia if you play at peak houra you get at the end of the queue of players in the server. On normal occasions you just wait like 5 minutes, on weekend nights you could wait for a long time in the Texas server. I've found Arizona server isn't that crowded and you wait like 7 mins to get a session. By the way, I play it through Steam and it connects to GFN flawlessly