Supplier Contact FBDI - Create user account for existing supplier contacts

Summary

Supplier Contact FBDI - Create user account for existing supplier contacts

Content

I have a requirement from my client to enrich existing supplier contacts master data, in order to create supplier portal user accounts for their supplier contacts.

Does anyone know if this can be done with the Supplier Contact FBDI loader?  There is a strong preference avoid manually updating the data (volume is approx 10,000 records). 

Looking forward to responses and suggestions for alternative means to achieve the desired outcome.