Maybe I was just living under a rock, but in case you missed it, too: As an EU Citizen, you can use your eID on Linux, for example I used the following #NixOS config:

programs.ausweisapp = {
enable = true;
openFirewall = true;
};

…and then started “AusweisApp” to use my smartphone as a card reader in order to log my desktop into https://ec.europa.eu/info/law/better-regulation/ to make my voice heard regarding animal welfare regulation in the EU. Cool!