I agree with Faithfulservant on this one. If a person does not come to Christ until the end, yes, there is little of their life that gave Christ honor, but they are with Him, not separated, if they have opened the door of their heart. I don't know if anyone has heard of the Share Jesus Without Fear....method(??don't know what to call it!), but that's what I'd do. First pray of course, then probably share a few Scriptures, at least John 3:16 ask these questions:
Are you a sinner? Do you want forgiveness? Do you believe Jesus Christ died on the cross for you and rose again? Are you ready to surrender your life to Him? Are you ready to invite Jesus into your life and into your heart?
If they answered yes to all, I'd lead them to pray to God basically what they agreed to in the questions. Eternity is a big deal, beyond our comprehension. It's worth it to try to aid them in coming to Jesus. The only way people can come is if the Spirit has led them, so we aren't doing much except being a tool for Jesus' work.