I don't disagree with you in principle, but this is is a case of when asking for directions being told "I wouldn't start from here". Our current justice system cannot cope with this miscarriage of justice in a timely manner, we know this because if it could it would have already dealt with it. So to me this is exactly when "extra-judicial" means are justified. That this is yet more evidence that we do need to change our justice system (E&W) is all well and good but the victims shouldn't have to wait for any such reforms to happen.
True.
I would let the Home Secretary "pardon" them pending formal exoneration by the courts.