I don't know whether it's still in print, but you might want to hunt down Science vs Pluck Or Too Much for the Mahdi, by Howard Whitehouse, published by the Virtual Armchair General. As the title suggests, it is a dedicated set for the Sudan. I have the original edition, but it reached a fourth. It's distinct from other sets, being designed as a multi-player game, with all players acting as British officers, and the Mahdists controlled by an umpire, but should provide inspiration even if your circumstances make it impractical to play.