Not sure where you are, but I can also recommend the MAS (
Master Airscrew) Stealth props for the Air.
They certainly tone down the noise and are as good as OEM props.
Trouble is . . .
1. MAS shipping from the US will be long now, and the $ conversion means they are a little more costly than OEM.
2. If you find them in Australia (I think a few drones shops might carry them), they will have the Australia reseller tax (huge markup) applied.
I got sets for my Spark and M1P directly, pre covid, both are excellent on those drones.
My BIL got them for his Air, and they are slightly behind the M1P for noise reduction, but still change the pitch down.
Sample . . .
I'm not sure where local is for you, just Australia ?
I've used Drone MRO before in South Melbourne for one small repair once, they had techs there very quick and good on the DJI stuff, had DJI aircraft, good pricing, they might carry some spares.
Problems I just tried to find link for you to their website, it appears gone.
Still contact info via google on True Local and Yelp, phone number there showing is 1300 852 435.