Director-adapter Sulayman Al-Bassam has brought an Arabic “Richard III” to Stratford-upon-Avon. “The form has freed him to consider contemporary Arab politics in a way that would have been all but impossible without the refracting mirror of Shakespeare, said Mr. Bassam, 34, who is half Kuwaiti and half British. ‘You could write such a play,’ he said, musing on the notion of a present-day political work, ‘but you’d be best advised to set it in England in the 1400s.’ “