Hi Kevin,
 
I may not be up on whatever discussions you are having with others about certain points of contention but I would like to chime in regarding the law being once again part of the tribulation period.
 
My understanding is that the law was our "schoolmaster" to "teach" us of our need for Christ by showing us our unreachable distance from God's standard. All have sinned and come short... Some of us have learned from this schoolmaster and turned from our meager attempts to keep the law in order to be saved and we have "rested" from our labors and bondage to the law and trusted in Christ to cleanse us from all sin and unrighteousness and therefore we have "graduated" and are no longer under the schoolmaster while others have only added Jesus on to their continued attempts at keeping the law thus missing the whole point of the law and are canceling out grace. As Paul said if righteousness came by works of the law then Christ died in vain.
 
These people will be in the tribulation along with Israel who also rejected Jesus and God is not willing to let them go without at least giving them one last chance to get it right. If he allowed them to be momentarily placed back fully under the pressures of trying to keep the law it may be that finally they will see the utter impossibility of keeping it and then turn to Jesus for salvation. In this way, none of the other problems enter into it that you have brought up about Jesus having to die again or whatever. Yes Jesus died and finished salvation but are you aware that many in the world are still teaching that we must keep the law to be saved? All who follow that cannot be saved. This is not saying that Jesus' sacrifice is of none effect but rather that they have made it of none effect for themselves by going to the law after Jesus already paid their way into the kingdom. They made it of none effect! Not God. And according to Hebrews, they do indeed crucify to themselves the Son of God afresh by doing this.
 
Moses was a type of this when he struck the rock which was Christ the second time (Moses describeth the righteousness which is of the law... as a testimony of those things which were to be spoken after) and his punishment was to miss the promised land (rapture) while living. He did enter it after dying, just as these saints can also do. All this was our example for the rapture and tribulation.