Firstly, congratulations on moving to the best state in Australia
I've had 7 yellow stickers over my many years of driving imports, and to be honest have't ever really found it too difficult to get passed, it's just a bit of time and effort to effectively restore everything to a manner which the pits will accept. Each Pit Inspector is different, so some will let things slide pretty easy, whereas others will make life tough.
I personally don't think you'll have many worries, and the local WA scene will help out with lending you anything you may require to pass the pits (i.e. stock rims or suspension etc)