I love the film, Arrival, so I should have thought of this myself. But a listener commented on my Blade Runner alternative mix that I should do an alternative mix for Arrival. Yes!
I absolutely love Johannsson's original soundtrack, one of my top 3 soundtracks of all time. This mix is not attempting to make something that I think is better than his. It's a collection of new tracks that fit with the style of the original.
All of the tunes are newer than the original soundtrack. All the tunes except On The Nature Of Daylight by Max Richter. That amazing track was used to open & close the film. Here, it plays backward then forward at the end of the mix. The film messes with the concept of the passage of time and the Richter track bookends the film to bring events of the end back around to the beginning. So playing it backward then forward kind of does the same thing. And it's crazy how much the track still sounds the same while playing backward.
Tracklist is in comments.