I have to say that the majority position in Orthodoxy seems to be that we simply don’t know what happens outside the bounds of The Church and it is inappropriate to circumscribe whither the Spirit might go. Salvation/theosis is indeed found within The Church. Beyond, well, who can say?
If that is the majority Orthodox position, then I agree.
Cardinal Dulles, musing upon the salvation of the unevangelized, in the third to the last paragraph tells us that “How that happens is known to God alone”, then, like God, tells us exactly how God does it in the last paragraph.