You might want to look into opening up a iban account in au for exchanging money. There are several companies that could facilitate that, e.g. wise. You’d probably end up with a euro account in Ireland that way and a aud account to exchange to. From there on you just suck up the conversion rate to aud on a regular basis and you transfer aud to aud.
Bank transfers for private persons in the eurozone are free, highly secure, simple and fast. For businesses transfers are usually a fixed fee, regardless of amount (couple of cents).
Adding to that that you can also easily make a separate WiFi network (tied to a vlan even) for IoT. OpenWRT makes this very easy.