Jehoikim was king for 11 years starting around610. ... The 3rd year of Jehoiakim was 607 That started the 70 years of captivity that ended in 537.
Not quite. 2 Kings 23:36 gives Jehoiakim's reign as 11 years (counting his accession year), and we know his last year was 598 BCE. So his 3rd year using Nisan-based dating (not counting his accession year per the Babylonian and subsequent custom) was 605 BCE (up until early 604 BCE prior to Nisan), which is when Nebuchadnezzar returned to the area to demand tribute after he claimed the throne.
The 70 years (of nations serving Babylon, not Jewish exile) ran from Babylon's conquest of Assyria in 609 BCE (conquest of Haran following the earlier conquest of Nineveh in 612) until Cyrus' conquest of Babylon in 539 BCE.
The Jews returned in 538 BCE, not 537. This was during the first year of Cyrus with temple construction beginning in 537, as confirmed by Josephus.
And that would end in 1914 when Jesus would be sovereign king on Jehovah's throne in heavenly Jerusalem.
Entirely wrong. 1914 is based on superstitious nonsense and nothing more (and the fact that something was 'supposed' to happen suddenly in or after October of 1914 is generally ignored by JWs and they just focus on the fact that 'something' significant happened in that year). The context of Luke 21:24 refers to a period that had not started in Jesus' time, and the duration of the 'appointed times of the nations' (when Jerusalem was 'trampled') is identified in Revelation as 3.5 times, 42 months and 1260 days, all being 3.5 years, and refers to the period from the Roman response to the Jewish revolt in 66 CE culminating in Jerusalem's destruction in 70 CE.