I think you're solving the wrong problem. Before you worry about the ethics of super-intelligent AIs creating and deleting human simulations at will, you need to worry about the ethics of humans creating and destroying human+ intelligent AIs at will. To me it's an amazing display of human-cetrism to only worry about the problem when it's flipped right back around in the much more distant future.

I realise this doesn't directly help you solve the problem, but maybe it will give you a different persepective.