I eat hemp protein powder in my hot cereal, which is usually either gluten-free oat bran or buckwheat. Hemp is fine on the diet.
I avoid dairy completely, and I make my kefir from coconut milk and coconut water. If you make coconut milk kefir, the type of grains required need to take an occasional swim in dairy, so maybe find a friend who wants you to make them a few jars of milk kefir once in a while. A housemate buys organic milk for mine to take holidays in, between batches of coconut.
If you make lactofermented sauerkraut with just salt brine, it’s probiotic and beneficial. I don’t believe the vinegar-based (store-bought) kind is recommended.