There is no way to practice high level handling because RVSM does not permit it. Most airbus pilots retire without having experienced direct law, dual hydraulic or EMER ELEC or forced landing. So there will always some failures that cannot be actually practiced but understood theoretically and that doesn't mean these cannot be executed when required. If the pilots of AF447 and QZ8501 knew the pitch, bank and thrust autopilot uses at those levels they wouldn't have done what they did. This awareness can be instilled in simulator by including it in training syllabus.