If anyone is interested I made a gamesave UXE installer that when booted with the trayopen gives you the option of installing UEEE into the unmodded backup, and the ability to easily switch back and forth from modded state to unmodded backup.. This means that if you install UEEE into your backup, you won't need access to an exploitable game to restore your UXE..
Note that in all cases, UEEE prevents you from accessing the XBL dashboard, so make sure you have your acct setup before installing UEEE..
See my webpage for info on Another Gamesave Installer..