So your argument is...that it is possible for Hitler (or someone like him) to go to heaven...so long as he jumps through your hoops and become born again before he kicks the bucket.
Is that right?
I don't have any "hoops" someone must jump through to be saved, I can't save anyone. If you have a problem with Almighty God knowing the heart of someone who is genuinely converted to Jesus Christ and saving him, take it up with God. The Apostle Paul said he was the "chiefest of sinners" because he persecuted and oversaw the murder of Christians. If God can save him and use him for His glory, is anyone too far gone for the gospel to break through?
While we were YET sinners, Christ died for us. While we were at enmity/enemies of God, He reconciled us through faith in Jesus Christ.