I've been told multiple times that the Platinum HHN pass is not transferable. I know, I'm in the exact same position as you... I also have the Frequent Fear Pass, and the nights are exactly the same. And I'd rather give my HHN Platinum pass to a friend. But it is used with your finger scan, so it won't transfer.
When we (my husband as well, who is in the same situation) did inquire at GR, they looked into it, and said our HHN Platinum pass can be used on another night of our choice. But we had to get this cleared with a manager, because they are generally not allowing it except for people in this very situation.