That’s essentially what I am doing. Everything is on the LAN by default. I have two instances of Traefik. One that runs only on internal VPN ips, and another on remote servers using public ips. So I can choose which services are accessible over lan/vpn or public (routed through a vpn to lan).

That doesn’t solve the authentication problem if I want to expose something to the internet though, or even sso inside the lan.