Simplest solution is leave settlers where they are just deem it and them Palestinian. They can become Palestinian citizens subject to Palestinian law or return to Israel proper. The problem is Israels more than the Palestinians. Israeli legal advisor Theodor Meron in 1967 told the then government settlements were illegal and contravened the explicit provisions of the Fourth Geneva Convention. What Israel did and has done was done knowingly.
U.S. to deliver 8 advanced F-16s to Egypt on July 30-31, U.S. embassy in Cairo says (Reuters)
from the article: Only by fear of international sanctions