Dump his carcass in the Indian Ocean along with the remains of Osama bin Laden. That way, there can never be any of the faithful trekking to his “final resting place” to pay homage to one who is destined to become the closest thing there is to an Islamic saint.
A public outhouse pit risks becoming another of the many Islamic “sacred sites”, and therefore inviolate.
How about dumping him in a Lava pit?