Just an idea, but try swapping meta rather than bitmaps. It would probably work better. Alternatively, you can export the active Camo distortion to a dds file, open it with photoshop with the plugin and alter one of the channels. not sure which one controls transparancy, but two things come to mind to do to this channel.
1 Make this channel a red color, save, import into map over the old active camo distortion, see if this works.
2 If that doesn't work, change the rgb to a red color (r=255 g=0 b=0) and the transparency to a value slightly less than clear, thereby making it a sort of translucent red color. No promises, but it might just work. Let me know if it does.