I got an idea of a secure network. Using a pc as a proxy in the network to route the pc’s network through it out to the internet. And no way around it so the proxy would have a network card which then would connect to the pc. I’m not sure if this works or what appliance it would have and if there are better options out there?
You can easily do this with pfSence. Basically you have WAN coming in and LAN going out and the router/firewall in the middle of that. All you need is a setup with at least 2 network interfaces.