I intend mixing the ones in ceremonial dress in with the lesser dressed types , I have listed all the specific regiments produced by the manufactures and am suprised how many different regiments it is possible to get, and over the last year have purchased quite a force.As airbornegrove says it's not historically accurate but will make them look better on the table, downside is they will take longer to paint. You can also use the ceremonial ones to represent Shakas forces , perhaps using them against those dressed in war-dress for actions during the mfecane.
Not sure what I was doing today , as I typed this I have decided to paint Zulus, thanks Cram!