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You do have an option to use your own equipment, but you need to make sure that it's NBN compatible.
For the TPG NBN FTTC service to work, you need to connect a VDSL Modem-Router to the NBN connection box.
As per checking, the Netgear Nighthawk AX12 is a router only, but you may try to bridge the TP Link VR1600v or enable its DHCP mode.
The VoIP service is only configured on the TPG supplied modem, but since you are not going to use it, bridging the TP Link modem won't be a problem.
You just need to make sure that your TPG account username and password is properly configured on your router.
Here's a guide on how you can turn on the bridge mode:
How to turn on bridge mode on the TP Link 1600v
You can also enable the DHCP mode and this community discussion can help you:
Let us know if we can be of further assistance. Thank you.
Thank you for sharing this information @bitola49.
Just to add, the home phone will not work using a third party device as the settings for the VoIP is embedded in the firmware of the TPG supplied modem.
Should you require further assistance, please let us know.