FYI, Zionist settlement in the area began in 1878. By the time of the Balfour Declaration, about 70,000 Jews had immigrated to the area for Zionist reasons. And considering that Zionist migration continued even after the British backpedaled on Balfour in 1922, there's every reason to think that it would continue absent Balfour in the first place.
- Lack of advance into Syria and giving up complete reconquest of A-L causes France and Britiain to come to an agreement for a condominum over the Holy Land. No Balfour Declaration and no Jewish settlement in the Holy Land.
(It's your timeline, you do you, but I hate the whole "The British invented Zionism in 1917" narrative)