Migrating Active Directory accounts from one Mac to another using Migration Assistant

There's a simpler way:

1. Log in as a different, admin, user.
2. Delete the account in question; select the option "Don't change the home folder"
3. Go to /Users and rename the home folder from username+deleted to the original, desired, short name.
4. Add a new local user with the same short name; you will be asked would you like to use the existing folder. Agree to this and it 'adopts' the previous folder, and fixes permissions. Nothing else to do.

Just tested this successfully on OS X 10.9

Run the Migration Assistant utility on the new computer, and it'll walk you through migrating the account to the new computer. It's actually good that you used a different name on the new computer, since that means it can bring over the entire account (by its original name) and it won't conflict with the account you've already created on the new (/temporary) computer.