Maybe the Saudis could pay the Egyptians to patrol a 20 mile security buffer zone with an Armored Division or two, for a couple of years as peacekeepers.
Looks like mopping up ISIS in the Hajin pocket is about to enter a new phase, as a wave of civilians is being let out. Likely to be followed by a more intense offensive/rapid advance. Can’t be too many more weeks left in them, if they are pressed.
Sooner the better.