I like the Engineer dissolution as the first image. The Weyland addressing the crowd in the 2020s would work great after that, imo. ALIENS had an unavoidable prologue to account for Ripley that worked quite well, but I believe the true opening of the movie was the SULACO and the waking from hibernation.

PROMETHEUS would have done well (if a bit confusing) as the first in the franchise. With no annoying fanboy expectations, everyone could settle down and enjoy the set-up to take us to the great mysterious beyond. PROMETHEUS seems meant to transition between ALIEN and what came before and long after. The first of this series seems to be more related to what came before and after rather than to ALIEN.