If that's all a bit hard but you need something before the lockdown finishes, a UniFi AC-Lite like CYaBro linked to is probably the simplest option. No IP config to worry about, just plug in, download the UniFi app on your phone, scan the QR code on the back of the AP and follow the prompts. Couldn't be much easier. 

If you get the DLink I mentioned, you can plug the first one to an ethernet port, configure in bridge mode - which will not need at address change and then plug the other ones in other rooms. Just follow the instructions during setup. 

1024kb: Take that Spark router & hook it into your network somewhere near the middle of your house. Turn Netcomm WiFi off, use the Spark router to supply WiFi connectivity. It'll send the data through the Ethernet connection to the Netcomm which will send it out to the internet.

There, that's a simple, no-cost solution that'll solve your relatively minor problem. If you start now, you'll be finished in 30 mins.

That would only work if DHCP is disabled on the Spark router.