You're correct that making multiple accounts is likely to get you banned from the site.
The only way to get an analysis of an externally-played game is to play through the game as unrated (or takeback) with a friend, and THEN get it analysed.
Using TAKEBACK mode, it is easier to correct mistakes. You can also apply CONDITIONAL MOVES to speed up the game.
The one way I can see you doing this is if you made another account and 'reenacted' it on the live rooms so that you'd just be able to submit it as normal. I think there is a distinct possiblilty that there will be a site regulation against this which is why I ask first (making multiple accounts is'nt usually encouraged).
And if this is not allowed is there another way?