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Josh, your assessment of the situation is accurate. Though related, the two activities - planning and execution - are separate in function and access, so you will need to have two separate Groups. In your case, both Secret.
For the Project, you can create a Project inside the Group and simply have the planning team use the Project. Except for the member management in the Group, it doesn't sound like this planning team would need to use the Group itself at all, just the Project.