Here is how they harmonize. The Scripture about appearing with Christ in glory is a promise for those who endure with faith till the end.
It is not for those who depart from the faith, as Scripture warns over and over can happen.
The two views are, I think, that either:
The born again may die again, and cease to be God's children
Some seem born again, and are not.
This passage,
Colossians 3:1-4 KJV
1)
If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God.
2) Set your affection on things above, not on things on the earth.
3)
For ye are dead, and your life is hid with Christ in God.
4)
When Christ, who is our life, shall appear, then shall ye also appear with him in glory.
The one condition given is, "if ye then be risen with Christ".
To those who are risen with Christ, they are instructed to, seek those things which are above, set your affecton an things above. The reason given is a description of those who have been risen with Christ. "Because you are dead, and your life is hid with Christ in God."
And then comes a prophecy, that is given to, and applies to, "ye . . . risen with Christ", that is, the born again,
When Christ, who is our life, shall appear, then shall ye also appear with Him in glory.
If you are risen with Him now, you will appear with Him then. There is no place given for some intervening time in which you may become dead again. Only, if you are risen with Him, you shall appear with Him. As prophecy, it will be fulfilled, and I trust that implicitly.
Much love!