Not the topic of the article, but security of opening anything up in my network is always super concerning. I really want a zero-advertise way to find and conne

Not the topic of the article, but security of opening anything up in my network is always super concerning. I really want a zero-advertise way to find and connect to my network. So, for instance, there could be a trusted server that I advertise my IP to so that I can find it when I am off my local network. Not dynamic dns, something that requires me to send them a key so that only my devices can get the IP. Then, some form of port knocking could hide the connection port actually used like I send a sequence of knocks based on my key encoding the port I will use to actually try to connect my VPN so that I can rotate that around. A bit overkill but I am paranoid now. It is a jungle out there and security is hard for experts much less people like me.