Please carry gluten free soy sauce. It’s actually not that expensive relative to normal soy sauce. There are also alternatives without gluten like tamari. Don’t lie and say it’s too expensive. Literally every sushi restaurant can afford to carry it.
A poke bowl should be gluten free.
Yes, they have a good gluten-free menu but you could do a better job of accommodating gluten free people by using alternatives in the first place without any added costs.