I may be in the minority here, but I think these worries are really exaggerated.
In the past it happened quite often to me that I was unable to play a game until long after the release, but even without changing my daily routines I have never been spoilered.
Recent examples would be Witcher 3 (haven't played it yet, but I have no clue on what happens in the game), Danganronpa 2 (played it this year. Came out 2 years ago and I wasn't spoilered despite it being a story-heavy game). In my experience, not getting spoilered is not as hard as it sounds as long as one doesn't actively search for it. You won't find me in the Import OT of P5, I won't watch anyone streaming the game, I won't actively search for fanarts, etc..
I remember the same discussion happened when Dark Souls 3 came out earlier this year and people were worried that they might get spoilered because Japan got it early. In the end, most GAF users who got spoilered just couldn't resist watching streams.