The wielder of 2 swords would be the dervish and their mounted version might best have 2 scimitars too, maybe a spear (does that get a sort of lance bonus but lower?)
on the rest of the questions: do what you feel is best, you are the artist
and don't forget a nomad on a flying carpet, eitehr as infantry or as scout, I'll use it
the sheik might be best as a mounted character on a horse.
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