Curry with potato in it and rice is ok.

One cafe used to do a lovely salad baguette that included potato salad.

Pasta/noodle sandwich is no no.

I think potatoes on a pizza is good.

Seems to be just potatoes. Are potatoes even a proper carb?

I like scooping up my curry and rice with a naan - I've never scooped a potato curry and rice with a naan, but I would try it.