Brian Klug, in his article (https://www.pij.org/articles/1899/is-there-a-plausible-alternative-to-the-twostate-solution) takes Scots, Basques, Catalans and Slovaks as examples, but the weak point is that they already live in separate territories, while Jews and Palestinians in Israel/Palestine live mixed. Better models are South Africa and Rwanda, where the peoples also live mixed, and they have one shared state with equality for all citizens (and in Rwanda after a very serious conflict between Hutu’s and Tutsi’s, so why not in Israel/Palestine?).
Furthermore Klug says that Palestinians want a separate state too, but is this true? The PLO accepted it in 1988 only after fierce debate. I think separate states is the priority of zionists, but not that of Palestinians. Palestinians probably give priority to full equality. E.g. BDS want three Palestinian rights (slightly less than full equality), but is undecided on one state or two states.
In my view full equality is the main goal, and only then either one or two states.