There's a cereal out there, wish I could get it here in Europe, by the makers of Cream of Wheat cereal, it's Cream of Rice. It may not sound appetizing, but it's mineral profile seems to be custom-tailored to renal patients.
General Mills, I think, makes it. Here's it's profile, if you try it, let me know how it tastes.
I may use an immersion blender and use the basmati rice I normally eat in my diet for breakfast, turn it into a cereal, maybe add some cinnamon.

150
% Daily value*
Total Fat0g0%
Saturated Fat0g0%
Trans Fat0g0%
Polyunsaturated Fat0g0%
Monounsaturated Fat0g0%
Cholesterol0mg0%
Sodium0mg0%
Total Carbohydrate35g13%
Dietary Fiber0g0%
Sugar0g0%
Protein2g0%
Calcium340mg25%
Folic Acid60mcg0%
Iron12.6mg70%
Niacin4.2mg25%
Potassium30mg0%
Thiamin0.3mg25%
Vitamin D5.2mcg25%
*The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.