Inside your portable Firefox, pre-install these extensions (they save to the USB profile):
: The gold standard for open-source, ad-free torrenting. torrent proxy websites portable
These websites act as intermediaries, allowing you to access torrent indexes (like The Pirate Bay or 1337x) if they are blocked by your network or ISP. JSM Central CroxyProxy Inside your portable Firefox
Why Firefox? Firefox allows you to lock proxy settings via a config file, which is easier to carry around. torrent proxy websites portable
When you open qBittorrent or BitTorrent and paste that magnet link, your real IP address is still exposed to the swarm. Your ISP sees that you are downloading copyrighted data, regardless of what proxy you used to find the link.