Yes that's the solution I've been doing so far. The Sennheiser pc37x comes with a 3m cable so length isn't an issue. The problem here is that I'd rather plug my headset to something that's at the front of my PC rather than reaching behind my case, unplugging my speakers, plugging my headset and then when I'm done reaching to the back again and unplugging the headset and plugging the speakers back in.
Unless I'm missing something here?