RecoverPoint for Migration over FC

My Customer has an existing vblock at site A. it's currently replicating to site B, using RecoverPoint over WAN.

Site A: (Cluster 1)                                                        site B: (Cluster 2)

VMAX40K (vBlock) --- 5 x RPAs Gen5 ======>>  5 x RPAs Gen5 – Vplex --  VMAX3 AFA

They just bought new VMAX AFA  recent at site A, and new RPAs for both sites. And the target config is as below, over WAN as well.

Site A: (Cluster 3)                                                        site B: (Cluster 4)

VMAX3 AFA (vBlock) --- Vplex ---- 4 x RPAs Gen6 ======>> 4 x RPAs Gen6 --- Vplex --  VMAX3 AFA

For migration purpose, we want to leverage RP between the Cluster 1 & Cluster 3 over FC.  Generally we need to put all cluster 1 FC ports and all cluster 3 FC ports in the same zone. The challenge in this environment is RPAs in Cluster 1 & 3 are on separated vBlock MDS fabrics, so we cant zone them together directly.

The option we are thinking is to connect half of Cluster 1 RPA ports to Cluster 3 RPA fabric. That means half of RPA ports are used for local splitting/journaling, and the other half dedicated for remote replication. Does that sound like a viable solution?  if not, what other options we have? Thanks in advance.