On mine, I just used a complete leg swap with the Evolutions Clone. I know this isn't exactly the same type of Commando, but it should still work if you are going to be able to repaint it. The leg armor will be a little thinner though, but in my opinion it still looks ok.
For mine I just swapped the legs with an SA clone. It took a little work but it looks fine. Have dremmel will travel.