I am trying to create a shortcut for the old refresh shortcut key of SHIFT+?
In Photo Mechanic 5, refresh did not have a shortcut. In Photo Mechanic 6 the shortcut was F5, and then the same was true in the new version until we introduced customizable shortcuts. So refresh doesn't ever appear to have been tied to Shift+?
That said, on my keyboard (a US English, QWERTY keyboard), ? and / are the same key. I need to press Shift and the key that has "?" and "/" printed on it to get a question mark, so other than the shortcut not displaying a "?" character, I'm not really clear what problem this is causing you; holding shift and pressing the key with "?" and "/" on it should do what you are needing it to.
Perhaps you are actually wanting the Rescan function, which has always been tied to the / key since Photo Mechanic 5 (and possibly earlier)?