My friend, when the school of Hillel stated Shamai's opinion, they made sure to understand it first. I encourage you to take a look at the Shuchan Aruch (Yore Deah 97:1) were it states clearly that in order to knead a dough with milk you need to give it a unique shape and if you don't, the final product can't be eaten. The purpose of a kosher certification is to inform which restaurant, bakery, etc. sell products that can be eaten according to Jewish law, and only uniquely shaped bourekas meet this requirement.
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from the article: Regulating the shape of bourekas makes a joke of Jewish law