We have a scripting doc in the technical documentation center you can check out:
http://s3.amazonaws.com/zertodownload_docs/Marketing_Material/White%20Paper%20-%20Automating%20Zerto%20Virtual%20Replication%20with%20PowerShell%20and%20REST%20APIs.pdf
There is a script for Bulk VPG edits. I think the example given is bulk NIC updates but I am sure that you can change the parameters around to update target RPOs instead.
Hopefully, this helps!
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