Safest way to resurrect a sim with NRAAS mods?

I would think if you remove occult-ghost you would most likely remove the sim. I would play it safe and save just before trying it so you could exit without saving if you don't like what happens.
The easiest and safest way would be to give them all a plate of Ambrosia. My sims have at least 25 in their inventory at all times.
If you don't have a sim that can make it, I have a lot on the sims 3 exchange that has treasure chests with stuff like that in them.