Can I bring the ghost pets back to life?

Maybe it's because I've owned so many cats over the years that have eventually passed on, but I find the idea of pet ghosts quite upsetting. (During the gameplay livestream where they showed the pet cemetery on Deadgrass island and Whisper the ghost cat walked by I cried! he looked so sad.)
OK, it's comforting to know they haven't completely left, but the fact that they're dead is just too much.

So I have an idea to bring the pet ghosts back to life; basically have a sim who spends their time resurrecting ghost pets, but I don't know how to go about it, so I want to know is it possible?
Is there a way to resurrect them? if so how?
Given that they've died of old age, can they be resurrected? (I always have aging off if it's relevant)
Also, if I resurrect the ghost pets on Deadgrass island will the game spawn more?