As I understand, the ethernet port on the 360 hasn't been cracked yet.
Why not try tethering a smartphone to provide an internet connection for the box directly thru USB? I got this idea from when I moved & had no internet. I tethered my iPhone with my laptop thru USB then shared an internet connection with my 360 thru ehternet. That's right, I had an Apple device working with a MS one indirectly.
I was able to play Live with limited features & it barely cost me any data with AT&T.
Possibilities:
1. FTP over the internet.
2. FTP over smartphone's wifi with your PC.
3. Internet browser on xbox.
4. ??A private multiplayer server where jtag'd box owners can play each other??
My coding experience is a joke so I cannot run any farther with this idea. I hope someone can try to see if this could work.