I think option one would be good, but if someone hadn’t finished in the proposed time frame, or they just didn’t like the book they could just not enter into the discussion. I suppose that’s maybe more like option 2 really 🙄 However, there may be other books that people have read that they’d like to recommend or otherwise that maybe wouldn’t be readily available for everyone to buy so they could be stand alone reviews (hopefully without spoilers). I’m thinking of those random books you sometimes pick up at fetes or jumble sales.