Measure heavy cream and water into a microwave safe bowl. Heat just to warm - not hot.
Stir in yeast and 1 teaspoon of the coconut flour, allow to stand for 10 minutes – it should get very bubbly.
In a large mixing bowl, combine remaining coconut flour with the almond flour, protein powder, xanthan gum, salt, baking soda and sugar. Set aside.
In a mini food processor, blitz sugar substitute until it’s a fine powder. Add softened butter, blitz until well blended.
Add eggs, blitz again until well combined.. Add ⅓ cup of the juice and all of the zest, blitz one more time to combine.
Add citrus mixture and yeast mixture to the bowl of dry ingredients, stir well to combine.
Arrange 2 sets of silicone mini bundt pans on a large cookie sheet, spray with pan spray.
Divide dough into into prepared the prepared mini bundt pans, filling each about half full. I like to spoon the dough into a large pastry bag and pipe it in, I find it a lot less messy.
Cover pans with plastic wrap, and allow to rise somewhere warm for one hour, or until they’re about 50% bigger than they were.
Preheat oven to 350F (180 C).
Bake for 15 minutes.
Check for doneness - insert a toothpick or knife into the center of the bread. If it comes out clean, it's done. If not, continue baking until it's fully baked.
Cool Paska for 5 minutes, then gently turn pans over onto a serving dish to continue cooling.