I'm a sucker for Outsider POV. I love all those ideas of seeing through Earth's eyes as they watch Grace's footage etc.
But has anyone thought of making a sort of Yao & Ilhyukhina Ghost!AU shenanigans? Like they're the nosiest people to haunt the Hail Mary, commenting/nagging on EVERYTHING Grace does like a duo of grandmas in the parc. Gossip become even juicer when Simon arrives, or Grace stumbles into Simon, your choice. They take bet on who kiss first, eat popcorn and are protective of Grace even if they can't be seen/heard/felt. They even go as far as to "haunt" Simon if he hurts Grace, intentionally or not. Like banging on the walls while he passes by or breath down his neck once in a while (they still keep it pretty toned down, they realise quickly Simon is twitchy and they don't want to make it a hell for Grace to live in the spaceship with a caged, nervous and terrified animal, but STILL, they need to make Simon see what he did was BAD!!)
(They also cheer when the two hug for the first time. Bonus point if somehow they need to intervene to push those two knuckleheads together to talk or something)
Like, Ilhyukhina bitching about her vodka draining down Grace's stomach as soon as they wake up. Yao being the sort of chillier yet compassionate, silent camarade. They are astounded by Rocky's arrival, they facepalm when Grace tries (and fail) to pilot the HM or when he chickens out of his first space diving. Also them trying to cheer Grace up and rooting for him during the fishing session, etc etc.
Bonus point if somehow, Rocky senses some entities hovering around Grace all the time and ghosts have international language translator once they die so they also gossip with Rocky.