The problem with this, though, is that no human is capable of living a life without sin. George Lucas is a Buddhist Christian, and if heaven is where the righteous come to live with God in the afterlife, and sin is antithetical to God’s very being, heaven should be entirely unpopulated. An infinite being has infinite moral standards, and no human is perfect.
That’s where the mitigating factors of infinite love and infinite patience would come in, presumably.
Maybe this would be resolved in the ST by whatever comes next focusing less on the unattainable goal of teaching people how to totally avoid the dark side of the Force, and more about teaching people how not to let it cloud their judgment.
Leigh Brackett’s TESB draft took this route, IIRC. I may be misremembering; it’s been so long since I read it.