If you are soy tolerant, add one half teaspoon lecithin to this mixture plus one teaspoon baking powder to help the leavening process. When substituting this mixture for a regular egg, add one extra. Duck eggs are often tolerated by those who have problems with chicken eggs. They can be hard to find. Look for them in Chinese markets.
Coconut milk is a good substitute for cow and soy milk.
Rice bran can be substituted for rice polish. Tapioca flour works roughly the as tapioca starch. GF breads should be beaten by hand with a wooden spoon or spatula. A whisk doesn't work - the batter should be a bit too thick for this. The mix master over-beats them and they get too fine a texture and tend to fall.