If I was in charge of Chinese intelligence, I would take advantage of the current western mad blame-everything-on-China frenzy and have some fun.
Launch so exceptionally petty and inconsequential ‘prank’ operations, like hacking the autocue of Australian leaders to add in some randomly stupid and blindingly obvious nonsense and see if they are brain dead enough to actually read it out loud live on air.
Also things like just have guys show up at all their public speaking events with baskets of songhua smelly eggs and handing them out for free as a ‘snack’, with plants in the crowd to throw the first egg if needs be.
Just lots of childish, personal stuff like that.
If Morrison and his minions scream about it, it would make them looking ridiculous and indirectly further discredit all the other made up BS they are trying to smear China with.
If they shut up and take it, then that will provide enormous entertainment at least.
Given the super petty and inconsequential nature of the acts, even if they can prove it, it would be too silly a thing to make much over.