Does British English have a word for dry, starchy savoury snacks that are not fried slices of potato?
"Nibbles" is what they would collectively called if at a party. I think that's the closest you'll get.
As a Brit I would still refer to Wotsits and Quavers as crisps. Anything that comes in a crisps-bag is crisps to me.
All the other things you mentioned I would call nibbles.