A hypothetical situation that I would be reluctant to dismiss as a straw man as it could very well happen. We would need to wait and see if and when it happens. Nevertheless an inappropriate comparison as our current situation is not like that. Instead of having arrested a CCP bigwig on our soil we (or rather our political establishment - our Opposition supports the government in this quest) we are attempting to impel a foreign power with quite an alien political culture to comply with OUR standards of transparency and probity.
MILO; similtaneously with building mutually benefical trade and other ties with our Asian neighbours to our northwest (among whom the PRC is the most important but not the only one by any means) we have indeed been cultivating ties with "other like minded countries (by which I can safely assume to mean "Western" countries)" all along. Better to have two strings to our bow than just one. The trouble with our Prime Minister (government?) is that he (they?) did not bother to sound out like minded countries (like yours) first to see whether they likewise had an interest in joining forces with Australia in pursuing China for accountability in this matter. We are, after all, a lesser power than the PRC and we need allies and collaborators overseas in order to get anywhere in a project like this. I feel that our government has made a bad tactical blunder in failing to do this.
Oh Milo: you are a true Canadian. You cling to the myth that the successful conduct of foreign policy has something to do with being in a permanent state of moral rectitude.