Now
The fact that Israel has nuclear weapons should be offset with acquiring the same nuclear assets for the Palestinian side. ABC (Atomic, Biological, Chemical) weapons are exactly what is needed by Palestine to offset the conventional military superiority of Israel. This would set a balance of power (or terror, if you like) which is the mechanism for peace.
Once Generalissmo Sharon and his successors understand they cannot attack Palestine and occupy its terrority and kill its inhabitants with impunity the sooner it will act rationally and with restraint.
Much is made of terrorist attacks by Palestinians against Israel. But during the Cold War, the US and Nato had many provocations aimed at them from the Soviet side and yet they reacted with restraint because of MAD. They did so because they knew the world could blow up thru miscalculation.
Israel, by contrast, acts like a bull in the china shop at minor provocations, like killing the extremist fanatic Zeeve who the world is better off without. It does so because like any bully they can beat others up and get away from it with the applause from the Israeli-centrics. After 53 years of failure to bring peace, a MAD policy is worth a try.
Naturally, the utmost secrecy is required by Palestine and its Muslim allies until a fait accompli can be sprung on Israel. Israel only understands the language of force and must be brought to heel. Our cities are at risk and we no longer have the luxury of letting the amen corner run our foreign policy. Pakistan can help with the Nuclear end of the triade.