Hi James,
Go to SPRO -> IMG -> ACCESS CONTROL -> USER PROVISIONING -> Define Request Type
Here you can maintain all your request types. You can disable the request type from appearing in NWBC using the check box "ACTIVE" as shown below.
Deactivate all request types except Emergency User Access request type. Now users will see only one request type in NWBC i.e. Emergency User Access.
Then in your BRF+ initiator just maintain an entry with Emergency User Access request type and corresponding rule result.
Let me know if you need any more details.
Regards,
Madhu.