

Current Pixels sadly no longer have a headphone jack.
The Pixel 8as battery can be replaced through the back side, but the 8 & 8 Pro battery can only be replaced by removing the screen first. Idk about Pixel 9/10(a/Pro).
GrapheneOS is like any other Android for things like data transfer. Plug in via USB or your preferred wireless protocol.
German releases by OCH groups are already shared widely through Usenet and private torrent sites, as OCH is such a big source of pirated content in Germany.
So yes, you’re free to share OCH releases to public sites. ZeroTwo releases usually include subtitles for all available languages so they might’ve a wider appeal than german-speaking countries.
Make sure you’re VPN & torrent client is properly set up, i.e. you’re torrent client is bound to the VPN interface.
I personally stick to private torrent sites as there’s less eyes on them given them being relatively small [1]. With so few people torrenting in Germany the speeds aren’t always great though. That’s why I mainly use Usenet.
[1] https://www.sb-innovation.de/showthread.php?35824-Liste-aktueller-deutscher-Torrent-Tracker-V2