Also, to be clear, I realize that ignorance DOES NOT SAVE. I realize that anyone who thinks it does is practically just being Protestant in that case. Salvation by faith alone, if you're ignorant enough.
I just believe that a soul who is invincibly ignorant *may* be able to find himself united to the Church, in a way known to God alone, IF other conditions are met (belief at least in what natural law tells us about God, no mortal sins, or perfect contrition for mortal sins committed, cooperation with any graces one was in fact given).
I don't think that happens all the time, indeed it might happen never, but I think you could speculate that perhaps sometimes it happens without being a heretic or denying EENS (if you say that the soul who is saved is not "inside" the Church, that's a denial of EENS)