LoT, your post raises some interesting thoughts.
I know that one of the biggest reasons people have a problem with EENS comes from a bad conception of hell, thinking of it as a monolithic place, a single cauldron of fire in which someone who exercised natural virtue throughout their lives, a kind grandmother perhaps who sacrificed her entire life for her children, or a father who worked 20 hours a day and then died saving one of his children from death, etc. In the warped idea of hell, these people end up sitting next to Joe Stalin and Judas Iscariot being tortured to the same degree. But that's ABSOLUTELY FALSE. Even one of the EENS definitions spells out that those in hell suffer to varying degrees, depending on their actual sins.
I believe that naturally good people suffer very little, if any, pain of sense in hell. Some who may have lived extremely virtuous lives, from a natural perspective, are probably even quite happy or, at the very least, suffer no more than they might have in this world. Perhaps we might find some native Americans in their "happy hunting ground".
We cannot question God's justice or fairness. Only he knows why these people did not receive the grace of faith. Perhaps they would have rejected it and merited greater unhappiness for all eternity and He spared them of this. We believe that God is perfectly merciful and perfectly just.
Recall that faith is a GRACE that is owed to no one, and that God can never be considered unfair for withholding it from anyone.