I think as long as it was removable it would work. Besides being fragile, the screen will also need to be supported somehow so it doesn't collapse under the weight of the grains. The joint between the screen and frame will definitely be the failure point.
Maybe if you could find a grate that could be attached under the screen, that would do the trick. A replacement grill grate or a cookie cooling rack might give you the support you'd need at a cheap cost.