^Sunflower or pumpkin seeds are fine additions. "Traditional" depends on the country. Greek is different from Turkish, is different from Persian, and so on. Different nuts are used, different syrups, different types of phyllo, different spices. Plus there are different types of baklava within each country/region. So, if someone is allergic, pumpkin seeds and/or sunflower seeds make a great substitution. Even if someone's not allergic, it's not really any different from using pistachios vs. walnuts, for example.