I think you are mistaken about the Support Party and the OpenID provider. Using StackOverflow as an example, SO is a third-party, and other sites (such as Google) are the OpenID providers (s).
A third-party (such as SO) does not have the right to say when an OpenID provider (such as Google) prefers to βforgetβ the user for their own purposes.
EDIT: I was not familiar with the PAPE extension. However, if I understand correctly, this does not allow the RP to say OP, "At your end, forget this user authentication," and this is what I think I want. It simply provides the ability for an RP to request another authentication for RP purposes.
I still donβt see a way (for example) for SO to register a Google user from Gmail after SO logs out.
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