Yes, that is one option that happens. If my time on earth is finished He will take me home. If God still has use of me on earth, then the other option is that God causes me to change my ways and come back to Him.
Since Heaven is infinitely better than having a Democratic Congress and Senate, then isn’t that a very good reason to stop going about the Lord’s business?
The scriptures don't give us that option. It is for God to number our days, and there is nothing we can intentionally do to thwart that using this reasoning. For example, if it was my plan to not serve God in hopes that He would take me home earlier, then that would be strong evidence that I really didn't believe in the first place. The truly changed heart doesn't work like that.
What happens to that sin that is committed from time to time? Is it of any consequence, or no?
It is of no consequence to my salvation, but it is certainly going to affect me here. When I sin I am obviously rejecting God. There will be consequences for this. There will be earthly punishment and discipline, and I will likely be hurting someone else, and certainly myself. Repentance and confession can certainly mitigate this. The closer I stay to God the more fulfilled my life will be here on earth. In addition, whatever "rewards in Heaven" means will be affected by the level of sin on earth by believers.
Please forgive me for continuing on in this vein, but I would really like to know more about earthly punishment for sins.
Pure speculation on your part. You have no proof whatsoever that God has any use for you.
I’d really like to know what confession means and of what use it is under non Catholic theology, especially to a Reformed.
Is is yet another mechanical exercise, entirely without meaning, like prayer?