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Not sure how that fits the lore, but it and the Shogun/Romance armies are the big existing gaps in the "Starter army for historical Total War fans" roster. Since the Empire has late medieval/early modern covered while Brettonia does the Middle Ages, I'd make Araby into the Ancient/Roman equivalent with horse archers, phalanxes, and elephants. The fun of the Empire is playing against the fantasy units with an army that is approximately a normal Total War force with some magical units added in. There’s probably a ton of animations and models for Arabian themed units from attilla they could use as a base for Araby, though, so I doubt it would be a huge cost in terms of asset production(they wouldn’t need to scratch make camel or elephant units, for example).
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Cathay would give a probably higher return (again you would need to be careful to fit in with the warhammer tone while still being respectful though)
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