These are not quite pre-70s, but...
Ernest Lubitsch's The Merry Widow (1934)
Orson Welles' The Magnificent Ambersons (1942)
Antonioni's Blow-up (1966) and Zabriskie Point (1970)
Nicholas Roeg's Performance (1970)
Ken Russel's The Devils (1971)
Terrence Malick's Badlands (1973)
Akira Kurosawa's Dreams (1990)
Or they could just start licensing to Criterion.
Ernest Lubitsch's The Merry Widow (1934)
Orson Welles' The Magnificent Ambersons (1942)
Antonioni's Blow-up (1966) and Zabriskie Point (1970)
Nicholas Roeg's Performance (1970)
Ken Russel's The Devils (1971)
Terrence Malick's Badlands (1973)
Akira Kurosawa's Dreams (1990)
Or they could just start licensing to Criterion.