There is definitively no needs of a law dealing specifically with necrophilia in a democratic context save of course to give work to laws makers and law manipulators.

Let's analyse the situation from a democratic point of view: in most democratic countries, a corpse is considered the private property of the relatives.
That said, everything is said.
Since one of the most worshipped values in democracy is involved, it is just plain as plain to expect democratic people to react a democratic way when one rapes their private property.
How are they expected to react when one is trespassing their property with muddy shoes? Buuurrrrz, bang bang, choke choke, syringe my sweet syringe or whatever. So there is no longer a necrophilia issue.

Case solved.