Can you substitute risotto rice for uncooked white rice in a recipe?

Yes and absolutely yes!!

I made a marvelous risotto yesterday using regular long grain ecuadorian rice. Obviously this type of rice doesn't have the starch content that arborio does, so if it doesn't have enough starch.... you should add some.

I used one teaspoon of cornstarch diluted in half a cup of white wine and added it to the skillet once the risotto and the shallots turned translucent (just at the time the wine had to be added when risotto is made). I used one cup of rice.

Then I cooked it in a really low flame, for about 18 minutes adding the stock and everything as usual risotto.

Finally, I blended the cheese and butter to behold a wonderful, creamy, gourmet-type risotto with regular rice!!

Enjoy.