Need help roleplaying a CN Necromancer in a party with a LG undead hating Paladin

[Sacrieur]

I've been looking into some metamagic:

[+0] Alternative Source Spell (Dragon #325): Prepare a spell as a divine spell for -1 CL.
Convince your Paladin that you're a wizard and can't cast divine spells, so it couldn't be you summoning the undead.

[+1] Deceptive Spell (Cityscape 60): Makes a spell appear to originate from a different direction.

[+3] Invisible Spell (Cityscape 61): The effects of your spell are invisible.
Convince your Paladin friend that you're actually a summoner just summoning evil outsiders and not raising the dead.

You can use the Misdirection spell to redirect the paladin to ping himself, but he would get a Will save. You can also use the Seeming spell to make your undead to seem like something else (no save unless interaction). Then there's always the Nondetection spell, which doesn't have a save.

Create a Fog Cloud to hide your undead.

The ultimate move here is Screen to hide all of your undead, which selective to just the areas where they appear, but it's a level eight spell.

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There's likely bunches more, I only looked through the SRD spells. Not to mention all of the items you'd still have to go through that can play a role.