@Allison663 we have a similar situation where we have a main residence and a cottage Aibnb on the same house block at Huskisson NSW.
We are currently have 2 insurances for each one.
We have Defense Service Homes as husband is a Returned Serviceman.
They cover us with a B&B for the Airbnb
Some Hosts on the Australia Airbnb FB page recommend an Insurance Broker. You could look up someone near Jamberoo.
Terri Scheer has come back online post covid for Holiday Rental Insurance
terrischeer.com. au.
NRMA has ShareCover Holiday Rental Insurance.
Cover from 1 night to 90 night you could try them.
When you click on them it takes you to
ShareCover for short stay hosts
You can pay per night or 6-12 months
I have just filled out for a quote for our cottage
For 2 nights 4 people is $11.53
For
2 nights 2 people is 11.16
If we were doing this for a few months I would probably do it this way as you can claim it back on tax
Search page is
quote.sharecover.com
I hope this information helps you
Laurelle