I am worried it will not be possible, as even if you manually update it there are problems afterwards.
Example - when I had a flow on setting an approver for RITM, a particular Approver on a particular record left the company, once you manually replaced the Approver, it was still requiring that Approver's approval. To fix this, a new person must have been added, and after Approval it was necessary to manually approve the Approval who left... it never worked doing it differently. And I have a feeling your case might be similar 😕
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