I think it would be important to have an independent inquiry managed by a judge or former judge so that no party could question its reliability. That would be an essential first step.
Ultimately, however, the objective is not the inquiry, but to take its findings seriously and to implement the measures proposed to counter foreign interference. The inquiry is just a process for determining ideas and proposing policies. If we rely on the motivation of the people behind the media leaks, the implementation of the policies is the key. Like Mr. Stanton, I have no idea what will happen, but I wouldn't be surprised to see the leaks continue even if there is an inquiry, because it isn't the inquiry they're interested in, but the action.