Inter-Site Purchase Order to Customer Order Data Migration Question

We are working on an effort to implement the India GET Functionality. To implement this new functionality we need to create a new Company/Site. We will be migrating from one site to another. As we work through all transactions, we have an issue regarding our open inter-site Purchase Orders > Customer Orders.
Specifically:
We have Intersite Purchase Orders (our India site 1300) to one of our internal Supplier: 10 where the connected Customer Order is on Site 10.
When we migrate the Purchase Orders (from site 1300 to the new site with India Get: 1301) we are looking for a way/best practice to reconnect them to the existing Customer Orders in Site 10.
Product Version: 24.2.6
We have close to 4,000 open Inter-Site PO Lines that will need to be migrated to the new site. And are looking for the best way to update all of them in mass.