One-To-Many Config – DR & Data Center Migration

We have Site 1 as a protected site.  It replicates some VMs through a few VPGs to Site 2 for DR purposes.  We now want to migrate all of Site 1 to Site 3, then restart that same old DR replication form Site 3 to Site 2.

• Can we control (with help of network team) the routing of the migration replication through specific WAN ports/links when the DR replication continues to operate?  There is currently production traffic across the WAN between Site 1 and Site 3 and we don’t want that to be impacted, so we’re considering routing the migration replication traffic across the backup link between Site 1 and Site 3.
• Once the migration is done, will we need to reconfigure Zerto VPGs in Site 3 (the new protected site) and restart DR replication from scratch?
• Did I explain our goals clearly – do you have any questions?
• Any advice on the questions I should be asking of our network team?