From what I remembered, you had to seek permission for each individual image. However, there is a new team, things may be different. Please let us know how it turns out.
Having had a good slow read of the Exclusive Contract - I have come to the almost certain conclusion that stock content most likely needs to be 'produced' as RM in order for it to not fall under the contractual definition of exclusive content. Therefore I do not think it would be theoretically okay to self-deactivate exclusive content and transfer it to RM without permission.
My best understanding of the contract is that the definition of what falls under exclusive content would most likely also include content which we have ourselves deactivated.