Thank you for offering criticisms instead of downvoting.

1. It’s better late than never. And looking into it still paves the way to put some people in jail.
2. It should be outside of those you mentioned. They’ll probably consider another war without interference, so yes, there should be peacekeeping forces occupying Gaza/West Bank, and some internal checking within Israel. It’s a good question of who though. None of those you listed are good suggestions, and I do struggle to think of a neutral one. The closest I can think of is United Nation, but that’s probably not enough.
3. One of the condition to prevent wars is acceptance of other people. So, yes, there should be support toward each other. Some of the Israelis are in support for Palestine civilians, and some Palestinians are in support of Israel civilians. More of that is needed. Much more in fact.