Many grocery stores will carry a vegetarian or vegan cured sausage in the organic / vegetarian section. If you're not pescatarian, regular cured Spanish chorizo works beautifully. You only need 1/3 cup of diced chorizo. If neither is an option, just add 1 teaspoon of smoked paprika and a couple of extra minced garlic cloves (or 1/4 teaspoon garlic powder) to give the creamy corn similar flavor notes as the Spanish chorizo.