Never trust the killswitch. If you use proton for torrenting, you can set your torrent client to just connect over the tun0 interface, which will only exist if the VPN is on

Idk if this helps you, but you can download the OVPN-Configs for single Servers and countries, so you can usw the VPN Client your DE provides. Also, rclone now has Proton Drive support

tor using ublock origin would be new to me. do you mean they now ship it by default or do you mean that you can install it like a regular firefox extension?