Dave, I don't think that is going to do what the OP needs.
Those splitters are to allow a non-USB headset to be used with a USB connection. From what the OP said, he wants to use a USB headset, and wants to split the mic audio from the headphone. There are no "audio" lines in the USB specification. Adapters will have a DAC chip embedded in the connector somewhere which is powered by the USB line.