Request to Hide Add button on External Candidates

Summary:

Is it possible to hide/remove access to the ADD button under External Candidates section on the Succession Overview page while still keeping the External Candidate as an option in the drop down for Create a Succession Plan Candidates>Add>External Candidate?

Screenshot of External Candidate on Succession Overview Page

Screenshot of Create a Succession Plan Candidates>Add>if 'External Candidate option' is removed via HCM Design Studio. Business still requires the external candidate option to be available.

Content (required):

Navigation: My Client Groups>Succession Plans>Scroll to the very bottom of this section and see External Candidates section. In HCM Design Studio we found the ability to remove External Candidates but that removes the drop down here, and we still need that option. The business requires that we still have a drop down to add an external candidate, but it is a default value of 'external candidate', not a named resource. We want to ensure 'external candidate' can be added to allow for the default value to be selected, but not allow the access for anyone to add