You could use something like portmaster to route only that program to the VPN.
Probably safer to configure your program to use the mullvad proxy. That way if mullvad is offline it just won’t work.
The gold standard for what you want to do is qubes, where you would set up a VM that can only talk to a VM that’s routing to the VPN. But that’s a lot of work. You might be able to set something similar with containers.
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https://github.com/Safing/portmaster
You could use something like portmaster to route only that program to the VPN.
Probably safer to configure your program to use the mullvad proxy. That way if mullvad is offline it just won’t work.
The gold standard for what you want to do is qubes, where you would set up a VM that can only talk to a VM that’s routing to the VPN. But that’s a lot of work. You might be able to set something similar with containers.
This other post may be interesting as well https://slrpnk.net/post/2096570
How do I configure it to use the Mullvad proxy?
I would Google transmission proxy configuration
You don’t, Transmission does not have proxy support. It was intentionally removed a while back & currently the devs have no plans to re-implement it e.g. https://github.com/transmission/transmission/issues/1375
Just use a VPN connection like others said.