Create a surrogate response - Supplier contract mandatory & 2stage RFQ to be closed and unlocked

I have created a 2-Stage RFQ type negotiation and is approved and now in ACTIVE status. The Supplier part of the Negotiation does not have any Supplier Contacts created in the system. Below are my queries.

1. Once the Negotiation is published, Business usually waits for response / create surrogate response before closing the Negotiation. But in this case, i am seeing the option to Create surrogate response only after closing and unlocking the negotiation. Please advise.
2. The Registered/Created supplier in Oracle does not have Supplier Contact and want to send responses offline(email/fax/phone). We wanted to use surrogate response option. But the system is mandating to select Supplier Contact from LOV when there is none configured for the supplier in the application which is contradicting the very reason of using surrogate response. Please advise.