I don't see a way that Palestine could ever function as two discontinuous parts, and the complete unworkability of the concept makes it infeasible for anything other than a one-state solution to gain momentum in Palestine. In an alternate universe, Egypt might have annexed Gaza years ago, a clearer sense of direction would have emerged in the West Bank, and something of a functioning state would exist for the Palestinians. But of course, Egypt was and is quite opposed to any such solution. So, my basic proposal would be to turn Gaza and the West Bank into two separate, independent states with the latter carrying the namesake of Palestine. If Gaza turns out to be a problematic, belligerent state, then treat it like any other nation in that camp: sanction them, hold Gaza the state itself accountable (as opposed to a vague assortment of belligerents), use diplomacy to achieve piecemeal progress. Surely, any front against Israel would be significantly weaker as the priorities of the two nations inevitably diverge.

This to me seems like the only workable long-term solution, aside from Israel causing a bloodbath in hopes of establishing total militaristic dominance over Gaza and eventually annexing it.