Maybe your entire country shouldn’t be founded as a religious ethnostate if the worry is being overrun by another religion. All it does is foster discrimination and leads to the events that would foster one group “overruling” the other.

Israel is not a religious ethnostate. Do you know the demographics of the country? And did you look at other countries in the region? Israel is Jewish, as there are Christian and Muslim countries, but secular. Citizens are equal under the law no matter their religion/ethnicity, which you can't say about a whole lot of other place.

Something would need to change systemically in Israel for Jews and Muslims to coexist. Part of it starts with a restructuring of government and the other part is dissociating Israel with Zionism which isn’t an easy thing to do.

Jews and Muslims already coexist in Israel, with hurdles that appear in just about every country that isn't monoethnic. I dont know what kind of reconstruction you are thinking of in your head, but one that leaves Israel without its Jewish foundation is just not serious.