I would just use expressed milk to make the pancakes!
The recipe I use does not require eggs and as I said I no longer follow a recipe - a big cup of rice flour and then slowly add milk (expressed BM would be okay) and stir, slowly adding more milk as needed until it is a nice thick, smooth batter. It should be very thick, not runny. Ad a tiny spoon (like a finger pinch) of baking soda (bicarbonate of soda) so they will rise. I also add a pinch of cinnamon and a tiny pinch of sugar for taste.
Heat a bit of oil in a pan and spoon the batter into the pan in small pancakes. The pan needs to be very hot. When they start to bubble on the top, flip the pancakes and cook anther 2 - 3 minutes. VERY easy recipe!