But if you decide to substitute not just regular rice flour but mochiko for the wheat flour, beware that the results will hardly resemble a cupcake! (isachandra.com)
You can also use mochiko in the batter rather than regular flour. (101cookbooks.com)
I was feeling adventurous, so I substituted mochiko (sweet rice flour) for the AP flour in equal proportion, and decreased the sugar to 1/4 cup. (isachandra.com)