[jauntywundrkind]

Never been a Mullvad user, but namespaced-openvpn (https://github.com/slingamn/namespaced-openvpn) was one of the only ways to torrent-over-proxies that I found (years ago); user namespace with the torrent client & openvpn as it's only link out.

Not sure what else folks do for this use case.

[c0balt]

There is gluetun, https://github.com/qdm12/gluetun, which servers a similar purpose whole supporting ovpn and wireguard (including prepared configs for various commercial VPN providers). It's usable with, e. g., Docker to have namespace-based proxying of traffic for a container.

[duskwuff]

Wireguard can be used in a network namespace.

https://www.wireguard.com/netns/