This is what most keto breads are. Source: the two loafs in my bread drawer that report 23g of carbs and 19g dietary fiber. Some of that 19g is cellulose.
And how’s the taste in those?
It varies by brand and type. Some are pretty bad. Aunt Millie's has a couple of really good ones, particularly their 5 seed and white. Aldi's white keto is good, too. Lewis has a good keto Hawaiian loaf. For whatever reason the keto wheat breads I've tried are a little too... woody for me. I'm not sure if they are available outside the Midwest. To be honest, I'm really happy keto bread exists because for about two years, I couldn't eat sandwiches (I have to eat less than 50g of non-fiber carbohydrate per day... so just the bread on a sandwich usually takes 90% + of that).