I found this very interesting when i was looking through TTG, not sure if it works though you all are welcome to try it.
Here is the TuT i found:
What you need:
Transfer Cable or USB
2 Xbox Controllers
Make a Copy of your banned profile on your computer
Open the second copy of your profile into horizon and change the profile ID to:
Put that profile back into your HDD or USB and turn on your Xbox
Now go onto Black Ops and select Multiplayer
*****MAKE SURE YOU ARE SIGNED INTO YOUR NON-BANNED ACCOUNT
1) Sign onto your Banned profile on your Second Controller
2) Hover over your Banned Account
3) Back Out
4) Go to Local>Splitscreen
5) Click the Y Button and go over to "xbox live party"
---------MAKE SURE YOU IN A PARTY CHAT--------
6) Click combat record
7) Press the "b" button
It will take you to your playercard
9) Hover over the "prestige mode" ----------You do not need to be level 50---------
10) Join your friend's session on your non banned account.
****It will transfer your banned account with you
This is not my TuT, all credit goes to TTG SEAN, it most likely works if he posted it haha
Hope this helped