Does this run on x86/64 bit systems? Or this is for Linux smartphones more.

I'm using it on a Fairphone 5 since a while. Works flawless

Please dont link with a Google Amp link.

Just a quick thought. These days you can create a special partition in the first part of your drive and just boot from it. No grub, no config really. You might want to take a look at EFI and an EFI system partition perhaps?

One idea is perhaps to have more than one device? A tablet at home could be used in some scenarios, the rooted phone for some others. Maybe you have an old device laying around?

Tailscale maybe? They have a mode where you can configure a site to site links, you could route the docker networks. https://tailscale.com/kb/1019/subnets

Just in case - there are also good linux desktop applications - check out Authenticator on flathub for example.

Jerboa. It ticks all the boxes, is updated, and looks good

Tbh, that's the only platform where it is needed?

My vote goes to Mullvad. Possibly Proton VPN as a second contender.

Is it just racism? I also don't get it.

+1 for Organic Maps. Create an open streetmap account and contribute - its a game changer for me. Instead of a consumer, you're a contributor. (That goes for all OSM ofc)