Urgent : Mass Update on PO Distribution

As a result of a major cost center restructuring, PO distribution lines need to be updated for all POS (1000+), totaling 25K lines or more. Is there a quick way to accomplish this?

As per Oracle SR and consultants, the only available method is manual updating, as the REST API does not support multi-line updates. I believe this highlights a gap in functionality. Additionally, since only buyers or procurement agents can perform this task, it could potentially take tens of days to complete.

Additionally, this process requires turning off PO approvals, which is far from an ideal approach.