I'd say combine the old sound with a new sound. Utilize some remastered tracks from James Horner and Jerry Goldsmith's tracks from Alien
(in particular, a revamped Ripley's Rescue
, Newt's Rescue
, perhaps? And Bishop's Countdown
. And Corridor
, from Alien
). Could be a good idea to bring back Elliot Goldenthal as well, or remaster some of his Alien3
The new sound should be Richard James from Aphex Twin
(someone who greatly inspired Die Antwoord and Neill Blomkamp).
Check out the tracks "Mould," "Tree," and "Grass," - as well as "Icct Hedral - Philip Glass Orchestration" to get an idea of what you're dealing with.