Gavin, why fossilized walrus tusk? It is not a particularly traditional material for Bali keris dress.
As i scan the news of the day i am not sure that your friend did these people any favors "dragging" them, as you say into "the world as we know it today"
I also have a bit of trouble seeing how this particular keris is somehow being returned to it's "rightful heirs".
I am all in favor for seeing that people who want to stay in touch with their culture and tradition have that opportunity. I wonder though if a better way to do it might not be to provide new blades for this purpose as i doubt that these people have any actual family heirloom connection to most (or any) of the blades you are "returning" to them.