I would highly recommend using a programmable transmitter to use with the usb interface version. You will be able to use all your programmable functions with AFPD or AF5 and this really brings out all the powerful features. Another benefit which is practical is that you're using the same radio that you're using in the field and this is important as it gives you the feel of your own radio.

To answer your question: Yes, you can get the Ikarus slave game commander and this will work if you plug in the original usb interface into your computer. But as I said, the game commander has no programmable functions such as dual rates, mixes, and the feel of the radio and gimbals is inferior. So, if you have a nice programmable radio, get the usb interface version with the proper adapter for your radio. You don't need the GC.