Resetting the "time since last being told I don't know shit on the internet" back to 0 once again...
I already have an existing and working setup used for other apps, it's close to the one described in this blogpost. Yes, it's complicated and inefficient, but it has reasons to be. I want to keep my qBittorrent configuration as close to this setup as reasonably possible for consistency. If your point is that it's counterproductive to follow this setup then... fair enough. I can just route traffic from the VPS to an exposed port on the local qBittorrent container over Wireguard, but that wasn't my preferred solution.
Running a torrent client through a proxy doesn’t isolated a process.
I was talking about network isolation, not process isolation.
make sure your traffic is routing there properly
That was pretty much what I was asking for help with.
I indeed have a domain name pointing to the VPS IP, with Caddy managing TLS. Other apps are exposed this way, and I will do the same for the qBittorrent WebUI as well. I like having Caddy as a single gateway where I can apply security configs and monitor all traffic, I was hoping I would be able to pass torrent traffic through it as well but everybody seems very much against it.
I already have wireguard setup as you describe so I guess I'll just give up on passing torrent traffic through the proxies and just open a localhost port on the qBittorrent container...