What about Artie from Glee as dude!Mac? It's an idea . . .

I'm so bad with actors' names. And seem to be mentally casting primarily Glee people in my head. This isn't too good, is it?

Stockard Channing as Keith! That's not Glee-related, and I can see her doing Keith's sense of humor . . . is she too old, though? Are we going to be like typical Hollywood and say an actress is too old?