Okie dokie.
So if this whole thing goes south, I've got a crazy plan. We get some appropriate herbs, medicines, etc, and put Adom into a deathlike coma so he can speak directly to the ferryman or even Anubis. It's the ultimate desperate plan. And given the rest of the party's motivations, it could be really interesting to see whether or not they just leave him that way. :)
Just a little ace up the sleeve we can try at some point if we get super desperate.