Yes. As long as there is nothing in the ingredients that is a dairy product, then it is not considered dairy, even if it is a dairy substitute. If it is truly vegan and without any dairy products in the ingredients, then it is pareve, and can thereby be considered kosher. There is the concept of mar’eit ayin, concerning perception and how certain things appear to others. In that regard, I am sure there are many who would say this practice should be avoided, particularly in public, as a passerby is unlikely to know whether the “cheese” product on the meat is actually non-dairy vegan, and thereby think you are breaking kashrut. But in the strictest sense of the Torah laws and halacha, as long as the product is not dairy in any way, it can be mixed with meat and still be within the bounds of kashrut.