NSW Rego Renewal When Interstate

How do I get my rego renewed? I'm travelling in WA with a NSW rego.

RTA sent me an email saying:
Customers who are travelling in another state, except the ACT, can obtain an inspection report from:
- the registering authority in the state or territory (eg Vicroads)
- an agent that the interstate authority has approved
- a recognised motor industry body that is a member of the Australian Automobile Association (ie RACV, RACWA, RACQ, RAA South Australia).

I don't really know who that means I can get an inspection from. In a follow up email they told me to call WA transport. It's the weekend, so I can't call now. Hopefully someone here knows before then?

I'm not likely to move back to NSW either, possibly QLD. Can I register in WA or do I need a WA license for that?