Can I give it a shot in your stead?
Let me play devil's advocate for a moment until you return so we can work this out better.
No less than J. I. Packer holds to the theoretical possibility of heathen salvation apart from the hearing of the Gospel but he notes, "but what we cannot safely say is that God ever does save anyone this way."
John Stott, a highly respected reformed theologian and minister, said:
No one is saying that one can be saved apart from the Lord Jesus Christ. His sacrifice and resurrection is and always has been the only way any man will ever enter heaven.
The position I am taking for sake of discussion is that God can reveal enough of himself to the unevangelized and regenerate them and have them repent and worship him like Seth and Enos and two thousand years of people did before the flood and these people be saved.
This is not universalism and it does not deny the exclusivity of Christ nor does it question that Gospel proclamation is God's overwhelmingly normative means of saving the lost.