Would make sense imo to auction them to the highest bidder and distribute it to the heirs. Or give the heirs shares of a corporation that holds the artifact.

I'm not sure about Indonesia government but I'm confident if my forefathers made artifacts and it got 'returned' to US gov what would happen is a bunch of rich city dwellers would get to see it in an exhibit somewhere, some director will see a fat salary and meanwhile I have no share or compensation nor practical ability to access the artifact.