Personally I use tailscale which should punch through double NAT. It’s a wire guard based mesh VPN, but an exit node should make it a normal VPN

You can use headscale with tailscale if you want to self host it. Headscale is a community made server implementation for tailscale

I run wiki.js for documentation for my home lab, but also things like the custom rom setup for my phone. However it’s hard to keep it up to date as I forget it exists. I mostly use it to document setting up windows server core with different roles as I don’t need to do that often, but most tutorials on the web are SEO optimised with low quality

This video from thiojoe is probably relevant here. It is mostly for scam websites, but maybe it’s useful for this too? At least gives you some platforms to contact