I would not think so, but have never tried it. Unless someone comes along who actually knows something (sorry, am not one of those) I would probably take one or two and try steaming it before making the real batch. Would take it out every so often and see.
Have never heard of a steak and kidney pudding, love steak and kidney pie. Woud love to see the recipe if you have a chance. Good luck.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!