Seems like a reasonable goal? Evict the indigenous populations. To keep them out of the "DMZ" sprinkle it liberally with mines. Perhaps build fences and walls. Let the UN or welcoming nations take the new refugees. Build a reclamation project on the rivers and send the water south.When the military arm of the Palestine Liberation Organization (PLO) began lobbing artillery shells against Jewish settlements in the northern Israeli province of Galilee from positions inside Lebanon . . .
. . . The intent of Operation PEACE FOR GALILEE was to create a 40-kilometer buffer zone inside Lebanon . . .
Easy!
Or perhaps subsidize "settlement" of the buffer zone. Then as the new "security buffer zone" is attacked by the disposessed from the fringes then capture another 40 km buffer zone.
Repeat as required until Israel is secure. Perhaps the Euphrates would be a logical boundry?