I learned from the newsletter of the National Organization of Social Security Claimants Representatives (NOSSCR) that there is a form for making an Advance Designation of Representative Payee, the form SSA-4547. Perhaps I should say that that such a form may have once existed or that it still exists in some state of limbo. We know the agency created the form. Social Security's manual makes reference to the form. NOSSCR has a copy of the form. However, the form doesn't appear on the agency's list of forms. You can't find a copy online. It's certainly not in use.
So, what happened to that form? I might have some clients who could use it. I think others would too. For that matter I could possibly use it personally. I'm sure that Social Security has a staff tasked with creating and maintaining the forms needed to run the agency and they must know what happened to SSA-4547.