So, currently, alolan and galarian forms cannot get family items. While I know that will be fixed in the future, I feel like some interim solution can be made rn.
Marowak: This one could made water absorb instead of grass. Ground globe helps with grass, while water is a common weakness between kanto and alolan marowak.
Ninetales: Rather than having water absorb, I feel like the family item could change to rock absorb, hence removing a weakness from both kanto and alolan ninetales.
Dugtrio. Same reason as marowak, both forms are weak to water.