Late to this thread but wanted to add one thing that was not mentioned in the original proposal to add waffles to the mash. This comes up every few years when someone wants donuts, or cookies, or brownies, or cake in their home brew (a post from a while back with a picture of someone who'd filled their mash with a variety of doughnuts comes to mind) and it's worth mentioning:
Fatty ingredients are not good for your beer, and not good for your equipment.
You'll see everything from a flabby beer with poor head retention and a mouth-coating off-flavor, to a film on your equipment that is not easily removed. Just an overall really bad time.
The best advice is that flavors like "waffle" can emerge from the interaction of well-known brewing ingredients, or from an additive as OP discovered here. But they won't emerge from adding the actual ingredient to the mash. This is generally even true of maple syrup (which can certainly be used as priming sugar or an addition to the fermenter) but adds very very little maple flavor when added to the boil.