Restricting Payables Access to Suppliers

Good day. Our auditors have mentioned that they would like to see us remove access to supplier creation/updates from Payables users. I have been instructed that by accessing System Adminstration-->Security-->Responsibilites I can create an "exclusion" of Suppliers from the Payables User.

This required that our Purchasing SuperUsers to have access through their menu options. This works in the sense that Purchasing SuperUsers have the ability to set up new suppliers. However, I found a problem. Purchasing SuperUsers can not set up new suppliers for employees.

Does anyone know how to allow Purchasing SuperUsers to have access to set up employees as suppliers? Or, might there be another module that allows for supplier creation?