I’m using an nginx reverse proxy with maxminddb for geo filtering. I have it limited to my state instead of country. If I could reliably go more specific I would. I really only rely on external access to the reverse proxy for family. I could use a vpn myself but I’m not bothering with the inevitable and endless questions from family.
I don’t know if it’s realistic or not but I would love to use a client certificate to authenticate with the reverse proxy but I’m not sure of the compatibility with mobile devices or smart TVs. If it would work even a self signed cert that’s valid for years would be a nice layer.