I think our thread got too deep and it won't let me reply. Feel free to contact me directly through https://apitman.com or post on https://forum.indiebits.io if you want to talk more.

But to answer your question, you'll need to run a CLI daemon on your grandma's computer. Something like ngrok static files would probably be the easiest:

https://ngrok.com/docs#http-file-urls

But since you're already setting up one daemon in that case, I'd use Cloudflare Tunnel and also run a basic webserver or WebDAV server alongside it to give you more control over how the files are hosted.

Also pretty sure you have to pay for custom domains with ngrok.

I'm not aware of a good solution to this currently, but it's a space I'm very interested in. The main problem is that the devices most people use these days (phones and laptops) are constantly being connected and disconnected from networks. So even if you solve the software problem and make a nice GUI program for your grandma to use which automatically handles TLS certs and tunneling, if she closes her laptop her blog goes down.

I think the way to do this may be to ship services as Android apps. Imagine something like self-hosted Google Drive that you install as an app on an old Android phone. After install you go through a quick OAuth2 flow to connect it to a subdomain and open a tunnel, and now you have 64-128GB of e2ee cloud storage. Just plug the phone in and leave it in a corner.

This concept can be applied to Nextcloud, Jellyfin, Plex, your grandma's blog, etc.