In theory, yes they could their image of Bloody Mary and refer to her by name.
Here's an honest assessment though: even in 2008, Mary felt... Unique... Compared to the other icons. A big part of that was because she "existed" before HHN. She wasn't wholely original. She also felt more developed and arguably scary than the anything else they've done. Combined with her history of NOT being part of the "icons," I'd prefer her to remain isolated from them.
Imagine if HHN had Jack, Caretaker, Director, Storyteller, and Usher. And then, included in there, was Cryptkeeper. It would be jarring, weird, and lessen the impact of the whole thing.