Do pièces montées survive in any other form?

I’d have to say yes, reader Brill. You still see them from time to time. Wedding cakes definitely fall into that category (croquembouche is a sort of wedding cake). The big novelty cakes you see on shows like Ace of Cakes and Cake Boss definitely count. Other than that, cocktail party ice sculptures spring to mind, but you really have to go to a major hotel buffet table to see a big mounted piece these days. The Superbowl notwithstanding, they’re pretty rare nowadays! (Thanks to Pillsbury for the photo)