@HelenCross has someone suggested Genus Ammophila for you? Their waists and abdomens appear to be more elongated than yours. I would suggest these are likely Tyde’s Sand Wasps (Podalonia tydei).
I'm not sure donhe's original suggesttion of S. catocaloides can be easily ruled out as the suggested ID for this moth species (see donhe's comment above). Based on the first photo image the forewing markings are a good match for S. catocaloides. See here:- https://v4.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=369563 Similarly. the hindwing pattern is also similar to S. catocaloides. however the hindwing spots appear yellow here rather than red. I do not think this moth matches S. magnifica for the forewing or hindwing pattern based on the BOLD4 evidence, see here https://v4.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=369559 Further, the BOLD4 records of S. catocaloides originate from a similar region oF WA as does this specimen, Kalbarri NP in Mid West WA. See also https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/917d3c19-e6f5-4ddd-aac0-76509835f2bd
