I think the best bet will be to mod the Flash one. It still won't be perfect though.
http://farm4.static.flickr.com/3083/275 ... 5c.jpg?v=0The lower padding seems to be Fireflys. Notice the bottle on the right side and the knife on the back. However, on the Flash figure, the belt doesn't go all the way around, and the knife is glued on.
I think I would do something like this if I were to use the Flash one.
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Remove all the areas I have marked pink. Then fill in the areas that I have marked green. Way more work than I want to attempt.
I also thought it could be possible to use a Shockwave vest and fill in all the ribbing.