Supplier transfer from ROS to ECC

Dear Experts,

We are planning to implement SAP SRM 702, ECC 6 EHP 6 (Classic) with ROS as a separate client with in SRM. We are not going to use SUS system, so we will not be activating business function SRM_SUCO_1. Activating this will enable the approved BP transfer from SRM SUS to ECC as standard, but as I said we don't have SUS.

The main requirement is to transfer the approved supplier from ROS to ECC system. This requires further questions to be analyzed which are:

1. This is not a standard feature. Should we connect SAP ECC and ROS using PI to transfer the    approved Business Partner to SAP ECC to create Vendor Master?
2. Will the data is sufficient to create a complete VMR in SAP ECC.
3. Can we use BBPGETVD report to transfer the VMR from ECC to SRM?
4. I understand the ROS is a copy of SRM maintained as a different client (as one option) Will that enable me to approval workflow when I am approving the business partner before manually transferring the same to SAP ECC system?

I have looked at relevant threads but did not get much inputs. Please let me know if anyone has a clue about it.

Thanks,

Krishna