Re, rav meir simcha – he reportedly said after the Balfour declaration that the pachad of the shevuos has passed, because the sole baalei batim of the land at the time had given expressive permission. However, he likely was referring to mass aliyah and not a government, which is what the declaration promised, in the word “homeland”.
As for the tzitz eliezer, you’ve got to understand that many, many rabbonim were sympathetic to the state, including yeshivish ones. It doesn’t mean it’s what the gedolei olam held, and their own talmidim went on to be as anti zionist as the rest of the Yeshiva world once the fantasies had faded and the reality of the horrific chilul Hashem had set in. I cannot imagine the olam haba of a person like the TE who sat and learned bekedushah all the days of his life and wrote dozens of seforim, but it doesn’t mean we are supposed to listen to his opinions stated at a time when there was mass confusion and a powerful urge to leave the oppression and violence that we, BH cannot imagine.
As for rav shlomo kluger… Source? The idea doesn’t add up – the shevuos were not made between us and the goyim, they were made between us and Hashem. And further, the goyim definitely broke their oath when they killed Jewish boys in mitzrayim, yet the bnei efraim were killed when they left early.
This whole “they broke theirs so we break ours” is a non starter.