Enable replication server in the same AIX cluster as the SP

The client has an SP server mounted on a two-node AIX PowerHA cluster.
When there is a failover, the SP service reloads from Node 1 to Node 2.
The client backs up OCP (Openshift) with IBM Fusion Backup. To store the data, a Directory-type STGPool has been created on the SP that uses the S3 protocol as an Object Agent.
The data stored in the primary STGPool will be copied to another secondary pool to have a second full copy.
The client does not have a replica SP.
The idea has been to mount a replica SP on the same cluster where the SP is mounted and replicate only the primary pool that stores the OCP data.
This would mean leaving everything mounted on the same cluster, that is, the SP on Node 1 and the Replica SP on Node 2.
The SP on Node 1 must be able to continue to failover to Node 2 to maintain high availability at all times. A case was opened with Support (TS018015279), and Development attempted to replicate the client's environment to see if it was possible.
Development indicated that it seemed possible on Windows, but it doesn't seem to be supported on an AIX PowerHA cluster, and they've asked us to open this RFE (idea) to verify whether this is possible.
If it's not possible, please provide a solution for the client, keeping in mind that the client doesn't have a new physical server to mount another Replica SP.