Samsung's 2019 TVs can remotely access your PC
engadget.com
engadget.com
Fiddle to set up, but worth it.
Seems good - going to try this out when I get some time next.
To test if you have been successful I recommend plugging into your untrusted network with a laptop and scanning with nmap (or zenmap for a gui. You shouldn't be able to see other devices).
Enterprise type WiFi devices like Unifi allow you to set up separate wireless vlans too. In fact Unifi WiFi to Unifi security router is probably the easiest way to get this set up.