I found another source for diastolic malt and it's cheaper than King Arthur. But I don't know if they ship to Canada or not. I have also read that you can get a version of malt from home brewing laces that works for bread, but I can't remember what kind it is. I have purchased from this company via their regular catalog for years. Their prices are good and the service is excellent.
Waffles made with sourdough are light and crisp whether baked as Belgian or traditional waffles.
They're perfect for topping with fruit and are especially nice because they require far less fat, only a couple tablespoons of oil or melted butter in a large recipe. They smell great, like bread. Use whole wheat or multigrain or white flour. The batter can sit for quite a while or be used right away, just be sure to add the soda just before baking. Then add enough flour to make the waffle batter consistency.