RickF1999,
Welcome! It's nice have you join us. My sister is vegan and frequently my dining guest. We go to several chains as well as local places. She never has a problem finding a way to tweak the menu items. Of course, we don't do FF for that reason! Once you've signed with enough MSCs to know their clients, you can go online and review the menus of those that interest you. Worst case, you won't do any dining shops and will find your niche elsewhere.
Stay in touch with this forum - you will learn a great deal and save yourself much grief by reading about others' mistakes. Best wishes.