I've saved a Mineralized Eyeshadow by repressing it using the method in the video. However it wasnt shattered into teeny peices. the domed part had splt off rather cleanly. Also, it does get kinda crumbly.
I would say, if its not in teeny peices, try to repress it. If its a no go, no harm done. Just transfer it to a jar and use it loose.