There is a verse that I have had in mind.
Romans 2:14-16 tells of the Gentiles who have not the law, are a law unto themselves; the law is written in their hearts [conscience (Genesis 1:26)] that on judgment day will judge them
With this verse it offers a possiblity that those who have had no chance of hearing about Christ will instead be judged by their conscience. After all, how were the Israelis judged when Christ has not yet been born?
With that, the possibility of them being saved is slim because like most Jews (Romans 10;1-4), most of the Gentiles would seek to be justified by the law.