I don’t think you are being too optimistic, that’s how it works on the HDR-FOX T2. The Humax dongle uses the Ralink 3070 chipset and their devices are preconfigured with the necessary drivers. Your dongle uses the same chipset so you should just be able to plug and play.
Edit. The Edimax dongle you have is really good, but I recommend plugging it straight into the USB port. The short, USB cable that comes with the Edimax adversely affects the performance.