Mission Advice - an imprisoned Elder God

Hi All, I’m about to run an A!C one-shot which is a parallel adventure with my long-running D&D campaign: the party have been hunting an aboleth lord who was overthrown and imprisoned long ago, and have found themselves transported to WWII where the Nazis are trying to awaken this entity.

I’m looking for recommendations for the most appropriate of the available missions for this plotline. I don’t mind modifying certain elements of the adventure if need be, e.g. replacing the entity in question with my BBEG. I’ve read the summaries and am tending toward Operation Marseille, but would appreciate any advice.

Thanks in advance!