XP to Windows 7 Migration without removing CM07 Agents?

Hello

There are no plans to migrate our old CM07 environment to CM12 so we need to support our existing CM07 clients during the migration to CM12. We need to use a State Migration Point to migrate all XP machines to Windows 7 (replace method). The majority of the XP machines do not have a CM Agent installed so we need to deploy CM12 to these machines. However, there are a large number of XP machines thatdo have a CM07 Agent and are still required to communicate with the legacy CM07 SCCM environment for inventory and software distribution purposes.

We understand that we cannot deploy the CM12 Agent to these machines because a machine cannot have 2 different versions of the CM Agent installed at the same time.  If so, how can we migrate these machines without removing the old CM07 Agent?

Thanks
Scott