I don't know much about tunnels or SSH, but no, you can't specify a destination IP address with TellVoxCommando.exe at the moment. I could add this option though.
Even if you could I'm not sure how that would work with UDP and a tunnel.
You can however set up VC to listen for TCP or HTTP commands, so for sure there is a way to talk to VC from a remote location by forwarding the appropriate ports. But currently you would still not be able to use TellVoxCommando.exe to do it. You could however, send commands from VC running on one machine to VC running at a remote location, or even by using your browser.