Convert not-prestaged WDS joined computers into managed?

Question

Is there a way to convert unmanaged domain computers into managed ones? Apparently all that would be needed is the GUID attribute and a few other attributes added to the existing  directory object for the computer.
From doing some web searching, I see that the client's GUID is directly obtainable from command line using a remote execution tool like Microsoft's Sysinternals PSExec.
I am really not interested in having to wipe out all these newly imaged, joined, and manually named computers just so that I can set "admin approval mode" in WDS to prestage them before re-wiping, re-imaging, then re-naming them all, AGAIN.
If no such conversion tool to go from unmanaged to managed is not available, perhaps it would be possible to write an LDAP tool that can do it?
Remotely get the GUID of an unmanaged but joined client from the command line:
* psexec \\%CLIENT% wmic csproduct get UUID
My comparing of directory attributes between a managed computer and an unmanaged computer, shows that the only really significant difference is that the managed computer has two additional AD object properties:
* netbootGUID   --   {4C4C4544-0035-4A10-8059-B8C04F564831}
* netbootMirrorDataFile   --   JoinDomain=1;

Answer 1

And so, here is my quick solution for network administrators.
So, you set WDS PXE to accept requests from any client, you imaged the machine, and manually named it from the desktop, and now you want to convert them all to managed devices that will auto-name when re-imaged?
Easy.
===============================
Create the following batch file: managepc.bat
for /f %%I IN (
'psexec \\^%1 wmic csproduct get UUID ^| ^
findstr /r ........-....-....-....-............ '
) do wdsutil /set-device /device:%1 /id:%%~I
=================================
USAGE:
1 On your WDS server,
2 Install Microsoft SysInternals PSTools
3 Put managepc.bat in the pstools folder
4 open command prompt, CD to pstools folder
5 Type: managepc "computername"
=================================
Usage example:
C:\Users\administrator.CORNELL\Desktop\PsTools>managepc el-lab-03
C:\Users\administrator.CORNELL\Desktop\PsTools>for /F %I IN ('psexec
\\el-lab-03 wmic csproduct get UUID | findstr /r ........-....-....-....-............ ') do wdsutil /set-device /device:el-lab-03 /id:%~I
PsExec v1.98 - Execute processes remotely
Copyright (C) 2001-2010 Mark Russinovich
Sysinternals - www.sysinternals.com
Starting wmic on el-lab-03...e on el-lab-03...
wmic exited on el-lab-03 with error code 0.
C:\Users\administrator.CORNELL\Desktop\PsTools>wdsutil /set-device /device:el-lab-03 /id:4C4C4544-004E-4A10-804D-C2C04F344A31
Windows Deployment Services Management Utility [Version 6.1.7600.16385]
Copyright (C) Microsoft Corporation. All rights reserved.
The command completed successfully.
===================
If the remote computer cannot be found, WDSUTIL will not be run.
====================
To convert a lab of ten machines all named "el-lab-XX" to managed mode, turn the lab computers on, and after their logon prompt appears, at the WDS server pstools command prompt, type:
managepc el-lab-01{Enter}
{Up arrow}{Backspace}2{Enter}
{Up arrow}{Backspace}3{Enter}
{Up arrow}{Backspace}4{Enter}
{Up arrow}{Backspace}5{Enter}
{Up arrow}{Backspace}6{Enter}
{Up arrow}{Backspace}7{Enter}
{Up arrow}{Backspace}8{Enter}
{Up arrow}{Backspace}9{Enter}
{Up arrow}{Backspace}{Backspace}10{Enter}
This whole process should take about 2 seconds per remote system.
=====================
Another computer management oversight fixed. :)
- Dale Mahalko