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Just one photo titled "beja-tribe-warriors-with-their-swords-red-sea-state-port-sudan-sudan" but in this case I think a picture may be worth a thousand words:
I have wondered if it would be a stretch to pit them against Copplestone Somalis or Empress Abyssinians?
Not if you don't mind using them as something other than Hadendowa. The Beni-Amer people, who are related to and live further south than the Hadendowa (they are considered a branch of the Beja by some, but not always), during our period bore such a resemblance to the Beja in costume and equipment as to be indistinguishable in a tabletop setting. I believe they are the most numerous grouping in Eritrea, and being largely Muslim have never got on particularly well with the Christian Ethiopians. They seem to have been used as "Friendlies" by the Italians in their operations in the region, and no doubt there were times when they skirmished with their neighbours on their own initiative. I don't have any evidence of them fighting with Somalis, but the proximity is there with the Afar (or Danakils), who for my money look pretty much like Copplestone Somalis.