I also doubt that it would be cost effective. A paint job would cost a few thousand dollars.An electronic camouflage system would cost significantly more. I'm not going to throw out a number; no one really knows what it would cost.
The picture, BTW, is impossible. You can't get that kind of resolution or color selection from current epaper tech. Also, current camouflage techniques don't use images anymore. The current pixelated camouflage relies on your mind tricking itself into seeing an image in the dots.
And I'm pretty sure that when BAE were discussing electronic Ink they weren't referring to E-ink (the company or the tech).