"Raise this request on behalf of" for customers?

I added all of our customers to have the permission "Modify reporter", expecting that this would allow them to see and modify "Raise this request on behalf of" in the Service Desk customer portal. However, according to Matthew's comment towards the end of the comment chain here https://jira.atlassian.com/browse/JSD-1285 , "raise this request on behalf of" is a special field that cannot be seen by non-agents regardless of Reporter modification permissions.

Is there a way to allow our customers to see and modify "raise this request on behalf of"? We have executive assistants who frequently request access and equipment on behalf of executives so this is a must-have for us