As weird as it may sound...I'd actually be up for the idea of Amell's Arrow and Gustin's Flash to show up in the DC movies but have it be a separate continuity from their own shows. I mean, it'd be confusing as Hell for casual viewers but I think it could work. Or, simply, Flash and Arrow dont talk about anything that's happened on their show so it won't contradict anything. I dunno, all this stuff makes my head hurt. I just know for a fact that I do not want two separate Green Arrows and Flashes especially since Amell and Gustin are so good in the roles.