Need Methods for Changing AD Short Names and local Homes for Mac Users

My company's security admins are doing a pilot program, of which I am participating; to change Active Directory IDs from X to Y. Essentially renaming account IDs. For Mac OS, that would equal the short name. It has traditionally been a big boo boo to change an account's short name on a Mac, yet this change is seamless for Windows users. My Way--- I backed up my local Home with Retrospect, went to System Preferences>Accounts to delete my user account there, then logged in using my new short name, and restored the contents of my Home into my new Home folder. -- What I Observed-- My MBP uses mobile accounts from the AD plug-in. The mobile account parameters prevented login with using the new short name, because of the short name change. I could however login to my XServe using the new shortname. Mac OS does not see my account with the new short name as the same as my account with the old short name. It sees two distinct accounts -- Looking at /Users, I saw two different user folders. I expected that. --Questions-- Is there a better way to move ownership of local Homes from the old AD short name to the new AD short name? I have 60 Mac users to look after and all will eventually get new AD short names. Again, I am in the pilot program so I have some time to prepare for the changes. We have Tiger 10.4.11 and Leopard 10.5.6- .7's. Any help would be appreciated.