Yes you have made a tabulation that from your interpretation harmonizes the biblical and secular data and I have commended you for your courageous effort. But your chronology is plainly wrong as it misapplies the seventy year period and does not account for the twenty year gap but if it works for you then that is fine with me.
Though there may be minor errors in my tabulation (for example, as I stated in my tabulation, some years may be out by a year or so), to put it simply, if I am "plainly wrong" then the bible must also be wrong, in which case, the argument would be irrelevant. You cannot actually indicate textually from the bible how my chronology is wrong. You keep stressing this "servitude-exile-desolation" thing, but it has been demonstrated that the base words from the verses concerned (shamem, chorbah, za'am) do not require complete depopulation for that period. The Society even acknowledges that the 70 years were of Babylon's dominance when it discusses Isaiah 23:15 and the 70 years for which Tyre was "forgotten" though the 70 years did not apply entirely to Tyre.
No, Jeremiah, Ezra, Zechariah and Daniel all in concert refer to aperiod of seventy years marked by servitude-exile--desolation. By emphasizing only one aspect such as servitude is dishonest and is playing false with scripture.
It is evidenced both logically and contextually that Zechariah did not refer to a period that had ended 20 years earlier. Jeremiah, Ezra, and Daniel each discuss a common 70-year period, during part of which, Jerusalem was desolated. The initial prophecy regarding this period is quite clear as to what event would end it, and there is no room in the scriptures for Babylon to start to be judged before the 70 years had ended.
WT chronology is simple so that all can understand it, it is practical because it builds faith in the fulfillment of prophecy and gives certainty not ambiguity so characteristic of all other alternative chronologies.
Simple? Not really. Most Witnesses don't even understand the doctrine, and it has frequently been said from the platform that Witnesses shouldn't worry if they can't explain the doctrine. The problematic doctrine introduces such oddities as the suggestion that that at Jeremiah 25:1, Jeremiah refers to Nebuchadnezzar’s rule relative to Jehoiakim’s rule appointed by Pharaoh Necho, and that at Daniel 1:1, Daniel means Jehoiakim’s third year as a vassal king to Nebuchadnezzar. The average Witness doesn't understand either this reasoning or its purpose. This is much more complicated than the simple truth that Daniel used the accession-year system and Jeremiah did not. It is true that the Society's interpretation does build faith - faith in a false hope believed by the naive, the gullible and the depressed. But all of the believers eventually stop believing, either because they find out the truth of the matter, or they die. Yes, the Society gives a fairly specific date for Jerusalem's destruction, but that date is based on dogma and ignores the simple facts stated in the bible about what event ended the 70 years.
The three texts that you refer do not support your position but simply affirm that Babylon would be overthrown by Cyrus which occurred in 539 and wouls continue to be desolate throughout history.Such an event was necessary for the seventy years to be fulfilled with the Return of the Exiles under Cyrus in 537 BCE.
Any suggestion of simplicity in the Society's interpretation is destroyed by your assertion, as the simple clear statement of the prophecy is that "when seventy years have been fulfilled I shall call to account against the king of Babylon and against that nation". The order of events is very very simple. 70 years would end, and then Babylon would begin to be judged. That the desolation of Babylon would continue is irrelevant when considering the simple stated order of events.