Looking at this, I am quite skeptical that Palestinian nationalism wouldn't arise on its own in this kind of scenario, *especially* with what you're structuring this as here. It'd be extremely oriented against *Palestine but it'd be a different animal altogether from the OTL model, probably led by the Nahashashibis as opposed to the Husseinis. I certainly think the rise of the Dominion has appeared without any Arab violence or reactions at all, which is extremely unrealistic, as is the absence of any kind of native Palestinian voice in all this. I especially found this bit verging completely out of realism altogether:
This issue – known ominously as “the Arab Problem” – was so concerning that PM Weizmann nearly created a cabinet position of “Minister of Arab Affairs”. This measure was considered excessive by many, however, and so in the end the problem was given to a Knesset subcommittee headed by Minister for Interior Affairs Ben Gurion. Including members from across the political spectrum despite Ben Gurion’s status as head of the Labour Party, the Subcommittee for Demographic Forecasting produced a number of ideas, most of them completely unworkable: the outright expulsion of the Arab populace, setting up of a stratified society like in South Africa or India, or encouraging/forcing conversion to Judaism. In the end, the only solution hit upon that would simultaneously deal with the demographic issue while not violating humanitarian principles, and help with land survey at the same time: passed on 23 May 1924, the National Land Act called for the establishment of a series of survey and appraisal teams, composed of one Jew, on Briton, and one Arab (typically a Lebanese or Syrian educated in a Western university). These teams would travel across the entire country, appraising every house and piece of land. The law further compelled the Jewish National Fund (a private non-profit company owned 100% by the Palestinian government) to purchase any land offered at 105% of its appraised value, while illegalizing all land sales between private individuals. Land would, in general, be leased out from the JNF for periods of 49 years. Interestingly, most of these notions had been considered anyway in other contexts, but were ultimately incorporated into the “Arab Solution” as a way to garner support from the rightists, who tended to support corporatism as well as nationalism.[3]
Simultaneously, Faisal I played on Syria patriotism and offered massive tax benefits to any immigrants to Syria from Palestine, and free land to any willing to settle in the underpopulated southern portion of his country, in particular in and around the city of Aqaba, which he hoped to transform from a dusty caravanserai into a mighty port. The end result was that some 200,000 Arabs are estimated to have emigrated from Palestine between the 1922 and 1930 censuses, over 90% to Syria, with perhaps 30,000 (likely mostly Egyptian) immigrating. Though numerous historians have failed to demonstrate anything conclusively, rumors persist of immigration control refusing to admit Arabs and the JNF refusing to lease land to non-Jews, a fact somewhat supported by the large number of documentless workers found following the 1952 crackdown.
Trying to boot out Palestinians like this will create Palestinian nationalism if it hasn't already existed by this point. And the idea that they'd simply leave for Syria shows a pretty fundamental misunderstanding of how Palestinian nationalism of the time actually worked. There were plenty of more popular leaders than the OTL Mufti who'd take one look at this and start rioting and shooting at the Zionists here. It's a good Israel-wank, but it's got precious little resemblance to how these issues worked IOTL.