Approvals planning unit and approve journal process "conflict"

Summary:

Content (required):

In my application I have a Power User that is the journal approver. So, an User creates and submits the journal and Power User approve it.

Unfortunatly, this role is in conflict with my requirement on the planning unit approvals process.

This Power User is also the Owner af his planning unit. I noticed that he can do anything on his planning unit. He can promote, approve and lock the entities. I noticed he can promote to another user but immediately after, he can take the ownership or approve the planning unit. Is it possible to limit the actions he can perform after the "promote"?