After a week of color-grade comparisons between the 1979 film and Isolation's two Nostromo DLCs, I managed to reproduce what I believe to be the most film-accurate cinematographic look, lens effect and all. Reshade mod download is in the second video's description. You could play the entire campaign and the other DLCs with this mod, and get truly immersed. You can also make any tweaks to the Reshade settings to suit your preferences.