With all due respect, you are getting the cart before the horse. You don’t start with Paul, you start with Jesus in Matt. 24.
Jesus knows more about prophecy than anybody, he the greatest prophet that ever lived.
He knew he was about to go to the cross, and the church to be left in the hands of the apostles. He knew what would befall his church in the endtime, the apostles the “transcendent you” in his discourse, he thus gave all the signs for his church to look for right up to the “end.” And that “end” is in verses 29-31.
He said nothing about a pretrib rapture, only the one at the “end.”
Paul and every other NT writer, simply followed Jesus in Matt. 24. The additional second coming pretribs think they see in Paul’s writings, including the ones you mentioned, is simply the same post-trib coming he set forth in Matt. 24.
It’s that simple, really. It’s all done in one event.
We’re just going to have to disagree on this topic of the rapture and tribulation. Again I have no indication from the Lord to prepare for the Tribulation rather to look for His coming....and His Promise to meet him ...”in the air”...just as is written.