I do the Nairn's rough oatcakes, can handle a maximum of two (12g carbs) even at breakfast.
I can also do ryebread but be careful, a whole slice is 40g carbs, I can do half a slice during the day.
Can't even look at wheat until evening.
Some people can do ryvitas or WASA crackers. Some can even do rice cakes. Some do Burgen bread.