Influenced by my aforementioned discoveries, I really would like to write a story of a Realistic Crux, minus the fact that it would become a sphere eventually. Maybe I can use this in some the Fate Trilogy and Co. stories (aka as the stories you'll probably never see, but that would have been really cool).
In the Shadow Book Universe (Story of a Minifigure), there are the Nexus Anomalies to make things right. Nexus Anomalies are non-universal effects caused by the Nexus that negate adverse phenomena that would impede the existence of life in Crux. In other words, they are a way of saying "The Nexus solves all problems single-handedly". In example, they normalise Crux's gravity so that it supports life in all its surface, sustain the cubic shape of the planet and force the Crux's Sun to orbit around Crux, without, however, affecting other objects in any way. This suggests a possible sentience of the Nexus and makes quite an interesting case.