"They could either go to the Asphodel Meadows, or the gods might decide that both the MC and Asterion took such heroic actions with the hotel to warrant Elysium. "
I like this thought especially given that there is such emphasis placed on heroic deeds needing witnesses in the trial with Asterion. He only missed out on Elysium in the first place because of this. But now so many have witnessed both his deeds and the MCs. The MC especially, I don't know whether it would traditionally being considered heroic in ancient greek culture but standing up to a god, stopping them from breaching rules of hospitality seems pretty heroic to me.