Can't help you on the reqs really, but I have some other input that you may want to consider.
One of Sweden's largest schools, training hundreds of pilots per year, uses the Duchess for ME training. They have specific operating procedures that keeps them far far far far away from stall conditions at any point of flight in that particular aircraft type. The Duchess is considered vicious close to stall and especially on one engine. In general single engine climb performance will be poor.
An aircraft fit to stay clear of...