Travis CI and Sauce Labs: Can I Get Safari Working?

I have Travis CI running Sauce Labs on Linux, OS X and Windows, running tests on Firefox and Chrome. I would also like to run tests on Safari, but I ran into this . In a nutshell, Safari will only work with a few specific ports for the Sauce Connect proxy, which doesn't seem to be using Travis CI.

Is there anything I can do to get Travis CI to work with Safari at Sauce Labs?