Gimp for Windows 2.4.4 - Using Layer Effects to add Stroke using Batch Mode

I'm looking for a way to use Gimp for Windows in batch mode with the "Layer Effects" Script-Fu (http://users.telenet.be/ev1/gimplayereffects_en.html), which is also attached to this post. Basically what I want to do is add a 40 pixel white stroke to many transparent PNG images that are in a specific directory. This isn't intended to simply add a square border around the entire image, but rather I want the existing image to be stroked exactly as it would work in PhotoShop with Layer Effects. I'd rather do this from a command line, and avoid using PhotoShop's unreliable batch mode. Does anyone know a good way to call the "Layer Effects" script using gimp's non-interactive batch processing mode? I have been trying for hours it's driving me crazy! :-)

Any help would be greatly appreciated!!!