A bit hard to say without seeing the figure, but I wouldn't worry about him looking too antiquated. During the First World War the Sultan of Darfur's army still had a few swordsmen in chainmail and helmets... facing Vickers machine guns.
Don't recall ever seeing Tuareg* wearing helmets, but plenty of other folks around edges of the Sahara did. And you can happily mix more modern weapons with swords and spears if you want, but it isn't necessary.
*Not sure I'd want Tuareg guides anyhow, Alexine Tinné was hacked to bits with swords by hers.