Re the Google Analytics / Tag Manager thing, I did lift a thread about that some time in the past, but have seen no advances on the subject. Perhaps it is the wrong place, if there is a dokuwiki.org repository where an issue can be filed it could be a better venue.
In any case, it's 2020; if you are using any decent web browser you are also using an adblocker like uBlock Origin, and as far as I know most if not all of them block Google Analytics traffic in the default working mode.