Force a domain computer to include domain admins in local administrators group

There is a windows xp computer on our windows 2000 domain.  The user has removed domain admins from the local administrators group.  I am one of the domain admins.  I do know how to create custom group policy or custom registry entry.  But, I don't know where in the registry this might be located.  I think I have found, using whoami /ALL, the correct SID to enter.  We do use kixtart as well and I am familiar with that too.  I can't allow the user to know what I am doing or log directly into their pc.  Help Please.
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As an idea, use the 'cacls' command to create a batch file which adds you to the local admin group, then run the batch file through the gpo when the user logs in (like a logon script that maps drives, but give you appropiate permissions instead :) )

Hope that makes sense

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