@ChrisAT 

First you need to understand what is routing network, then you can choose method to reach your device from 1.x (VPN) to 0.x (LAN).
There is many ways to do this, so everything is up to you if you find time and read proper manuals (not from TP-Link) ;)

  @ChrisAT 

You can trust TP-Link on implement things right, so you take care of it yourself.

If you use OpenVPN on Windows/Linux you can modify ovpn exported file from Omada (and you have to).

Just add below line to parameters (before certificates)

route 192.168.0.0 255.255.255.0 192.168.1.1

This line tell your client that 192.168.0.97 is behind 192.168.1.1 (VPN server) and then you should reach your device.

To check if routing is right you can perform (after VPN connection is established):
- Windows: tracert -d 192.168.0.97

- Linux: traceroute -n 192.168.0.97

and MOST IMPORTANT THING IS YOU CANNOT BE SOMEWHERE ELSE IN 192.168.0.0/24 NETWORK, because your clients will stay in local network (same network somewhere and your LAN in home).

This is why admins don't use 0.0, 1.0 networks at home, work, remote sides, etc ;)

Unfortunately TP-Link implement many technologies as they want (partially or even worst) without clear documentation!