Air superiority would prove difficult to Westafrika maintain with Egypt's SAMs supporting assaulting troops. The Westafrikan armor charges would be disastrous, as they're rushing Egyptian armoured elements and infantry anti-tank weapons, infantry charges would be an absolute slaughter as well, with minimal cover to hide them from heavy machine gun fire. Motorized flanking is ineffective from infantry-anti tank being able to also destroy APCs, trucks, and other transport vehicles with ease. Also bringing in ocean water is only practical for so far, the majority of your territory would still be useless and Egypt has actual like... cities and fertile lands?