Everything depends how you read "share soulmeld" Feat says that "At your option, any soulmeld shaped by you and
currently affecting you can also affect your familiar"
Necrocarnum circlet gives ability to animate corpse with crown bind, share soulmeld doesn't say anything about binds, but if bind only gives extra abilities to soulmeld i would let familiar to use it and animate extra corpse.
I wouldn't give another soulspark familiar, because soulspark familiar soulmeld doesn't really affect you. Soulspark soulmeld is soulspark familiar and it unshapes when familiar takes enough damage. If soulmeld would give ability to summon soulspark familiar then it would work, but it doesn't.