Forget green screen. How about a massive theater sized tv to fill in that background.
https://io9.gizmodo.com/how-the-biggest-tv-youve-ever-seen-helped-first-mans-os-1832926888
https://i.kinja-img.com/gawker-med...ogressive,q_80,w_800/b4snxquxc0bpmhy4heyc.jpg
https://io9.gizmodo.com/how-the-biggest-tv-youve-ever-seen-helped-first-mans-os-1832926888
https://i.kinja-img.com/gawker-med...ogressive,q_80,w_800/b4snxquxc0bpmhy4heyc.jpg