I think a solution that I would prefer as a vegan and that wouldn't impact others is for the main menu to say at the bottom "ask for our vegan/vegetarian menu"

I think a solution that I would prefer as a vegan and that wouldn't impact others is for the main menu to say at the bottom "ask for our vegan/vegetarian menu" so that for me it's easier to pick things, and no one else needs to see the labels. It also might invite the restaurants to provide more vegan options and potentially include some (without labeling) in the main menu.