Avi K:
The Brisker Rav, the Chazon Ish, Rav Shach among many others, held that the founding of the State of Israel, was a terrible thing.
The Chofetz Chaim, too, was against Zionism and even said “Kook Shmook” when he say Rabbi Kook’s piece about how soccer players are holier than neviim because they’re building the land.
So nothing you’ve written in any way impacts this. Even *if* there is a mitzva of Yishuv HaAretz still in effect during galus, this cannot come at the disastrous expense of violating any of the oaths, as history has now shown way too powerfully, Hashem Yishmor.
That signature on Israel’s blasphemous declaration of independence, assuming it’s legit, etc. is also not a proof to anything except that tactically speaking many gedolim held that once the State was a forgone conclusion that it would be better to work with it to minimize its damage. But this doesn’t at all change the clear halachic violation that the state and Zionism are.
Everyone, including Rabbi Teitelbaum, understood that since the Satan succeeded in his greatest triumph since the egel, it would be a catastrophe if the Arabs were to win in a war against Israel. But that didn’t change the halachic status of the State. Zionism and the State are still Avoda Zara and a violation of the oaths and other things, and tactical responses to the State do not change this.