Converting PO with specific revision number

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We're converting POs from legacy EBS system to Cloud using FBDI. We have a couple thousand open POs that have revision numbers, up to 20. We are retaining PO number from EBS and would want to retain the revision number as well, so that the next rev for the same PO would be 21, for example, and the proper revisions would be sent to the vendor. Since we're not able to load POs with a specific rev via FBDI, what other options are there for us to retain that revision, besides appending the -20 as a suffix and new revisions