The self-reported version from `pkexec` could definitely be clearer. Instead I checked the versions of the installed packages using `dpkg -l | grep -i polkit`. On an up-to-date Ubuntu 20.04 desktop I see `0.105-26ubuntu1.1`.
If the Brazilian Model M uses the same cable as the US Model M then I'd be happy to send a cable your way. Feel free to reach out if you're interested (email's in my profile) and we can confirm whether the cables match.