I'm not too sure how the Jewish population is going to swing.
On the one hand, something like ~77% of OTL Jews just up and vanished (according to
wikipedia, 1970 Israel had 86%, and 2010 had 74%. I can't find something closer to the ISOT, so you get an estimate). This is a massive blow culturally and communally, and will definitely provoke strong reactions, especially since Israel's 2000 population was just over 6,300,000 (Oh hey Jewish victims of the Holocaust, you are a frightfully similar number, but I'm sure that's not relevant). On the other hand, the vast majority of Jewish Zionists were living in Israel because, well, that's the whole point of it. On top of that, the Jews living in the UAR are happy, healthy, and thriving, and I can't see them being unwilling to reach out to their kin across the globe (even if they'd be cautious due trauma from their timeline's Tkuma). By the same token, I can't see most Jewish communities outside the UAR being unwilling to at least open a dialogue, even if more conservative groups would still hold to Zionism. But most OTL Jews now remaining live in the USA, the biggest rival and enemy of the UAR, so they'll have to be careful by definition.
I could see Starmaker taking this in any direction he wanted, really. AIPAC however is going to last for a few years at least.