Sept 23 is the feast of the trumps and its a jubilee year. The temple has not been rebuilt, the man of perdition (the false witness) has not appeared. So no Jesus is not returning on the 23rd. A very complicated set of events must occur in advance of the coming of Yesua. Which is not to say it couldn’t happen fairly quickly.
Yes, you have well-pointed out the remarkable things that will occur in the Tribulation and lead into the Great Tribulation.
The only thing I would say, if I’m reading you correctly, is that the Man of Sin, the Son of Perdition (II) is not the False Prophet - they are two distinct beings and each are captured and thrown into the Lake of Fire together, at the Second Coming (Revelation 19:20).