I'd have to agree with the above comment, it'd be unlikely that you'd even hear about it if you diverted. It is inconvenient but all of the companies involved understand wx is beyond anyone's control and that it goes with the territory of operating aircraft into these ports.
YPKA is great option - CTA and the weather is usually good, save for cyclone season on occasion. Stacks of runways in the Pilbara, most of them have refuelling facilities too. Getting a new loadsheet and flt plan are pretty simple as it's all electronic anyway. Not really a big deal (although maybe it was in years gone by)
From experience I think the biggest threat in this region is the large amount of traffic and the potential for separation breakdowns, not weather.
But four approaches is a lot. Will be interesting to see what comes out of it.