I don't think the perception would even need to be overridden. Anyone who is an integral part of a simulation would not be able to perceive the world around them to be a simulation unless they have an outside point of reference.
Which, like you said, turns the whole question completely moot. Either we live in a simulation or we don't - you can choose to believe what you want, because short of the game programmers choosing to communicate with us in some way, we will never find out the answer.