No / Yes / No (unless you meant Europe)

Caldav with decsync and syncthing to synchronize across devices

Arch linux dropped 32bit support a few years ago. But you could probably still make a 32bit build yourself.

Right click on the video under ublock select block element. A popup will show up in the bottom right where you can fine tune. If the video has a custom right click menu just do it anywhere else and in the fine tune options click select element then the video. Also make sure you use uBlock Origin.