nice. Rice pudding in soup? You have blown my mind. Also reminds me of cremola my mum used to make. Yum!
I know , I come from the ( made up ) french cooking school of If its Mad but tastes right , its then Not Mad.
So my justification is - You add Rice ( powder ) to Soups to thicken them , the soup was a little too watery for my taste and the texture needed improving.
The Nettles can make a very strong ' metallic ' taste occur , and Dairy tends to lessen the pungency.
Also as I was going to add a dairy element - cream , to soften and enrich the Soup the inclusion or Rice Pudding kinda makes sense on both points.
Hope that makes sense? Try it and let me know what you think.