I can't speak to the nuance of wiring looms as I prefer to avoid looking under the playfield, as you never know what surprises you will find there, but with regards to the original topic living in Perth the reality is pinballs have always been difficult to find especially if you have a penchant for A list titles.
The change I have noticed here in Perth is that B and C titles have definitely gone up in Price.
On the subject of professional restorers, I wish we had a few operating here as I am always envious of seeing those for sale in the eastern states which I would gladly buy if they were here.