BPM Workflow - Managers assigned to PTO Requests

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Is there a way to re-assign managers already attached to tasks within BPM? Here is my challenge...

In closing out PTO for the year and -- due to managers who have terminated or employees who have been re-assigned new managers -- there are pending PTO requests assigned to old managers. My team has to manually reassign these requests one-by-one to the new manager in order that the current manager can approve. Is there a way to update these PTO requests to the new manager -- in mass? We have hundreds that need attention.  We do not use the Line Manager, so the "Automated Reassigning of Pending Approvals and Correcting Invalid Supervisor Assignments" task is not a solution.  We