Convert not-prestaged WDS joined computers into managed?

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.

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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?

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Remotely get the GUID of an unmanaged but joined client from the command line:

* psexec \\%CLIENT% wmic csproduct get UUID

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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;