Combining a get posters here, @Disillutioned JW and @TonusOH:
That confirms what I thought about your approach. You consider the Bible to be far more reliable than science. In contrast, I consider science to be far more reliable than religion and the Bible.
Right. That's why I prefer to start at Jeremiah 25. Even though COJ shows quite clearly 587 is the year, WT apologists always have their trump card - mainly arguing from the Bible as the absolute authority. For such people, no amount of physical evidence will suffice. It will always be "clunky" and "wishy-washy", as scholar states. If you could imagine a world where we could time travel (in a DeLorean, of course!), go back and visually, physically confirm 587 as the date, it still wouldn't be enough for scholar. Some objection about the reliability of the time machine would be raised.
If all of these varied translations are from relatively few manuscripts, then it shows how difficult it is to get a consensus (impossible, by the look of it).
I don't think that is the case. There are translations that tend to be more literal, and those are always good to focus on. Some translations offer a "common" language format. All sorts of paraphrasing goes on in this case. For most religions out there, remember, the date of Jerusalem's destruction doesn't play a role in a far-fetched prophetic scheme. So something like 25:29, might be rendered with "first".