Populating OD with machines

I'm using the AD/OD sandbox method, cause quite honestly getting the Windows server admins to play nice with getting kerberos cross-realm working is an exercise in bashing my own skull against a wall and hoping gold appears. Anyways, all our machines are bound to AD, and I like to manage their settings via OD. The problem I have is that OD uses the MAC address as the unique identifier, and AD does not. Fine, so I go in and add it via Bonjour, EXCEPT that only works if I'm operating from the same subnet as the machine I'm trying to add! And there's no "pencil" that I can use to manually enter the information. I have a database of all my machines and their MAC addresses. Is there a way I can import the info directly into the OD LDAP database? Cheers