Think, ask; what is the the goal, whats the purpose of this training; education, skills practice, or ….
Is there value in using a simulator or can some other method be used.
What benefit for the 'student crew', or is this only enhancement of the instructors power to create failure.
Whats the likelihood of encountering such a failure; if remote, then a discussion of factors might be sufficient.
Better to spend time in avoiding a stall during high workload operations, or remember to calculate landing distance required in conditions worst than given.
Non-normal involves those situations which differ from expectation, not the likely outcome of improbably failures.
Focus on situations with significant opportunity for human variation, not a combination of technical malfunctions.