Unfortunately, from what I've seen, you are unable to store multiple networks on the CC. I don't believe it was designed for that much portability. I happen to have a laptop with me and was able to do the setup. Since I wasn't able to get an internet connect, I wasn't able to test if I could cast from the GN2. My expectation is most likely not. But I had a tablet with me too, and would have tested it with that.
As for how it would preform, I assume for Netflix and application with CC extension built in, no problem. Trying to cast a Chrome tab, that could be iffy since it would depend on well WiFi tether can handle the that much traffic and the PC.
I haven't fiddled with it since then. But it's definitely possible with some tweaks.