Yeah, we are essentially fucking a homunculus with Kishina's memories planted artificially.
...
You know? This game is getting dark real quick. Luckily, there are no more sexy dead women we need to revive, right?
R-right?
Not memories, soul.
Souls are a proven thing in Naruto which can be manipulated. Such as pulling them out of the afterlife to create a type of super powerful undead.
Naruto's dad summons the god of death. has his soul devoured in exchange for having god of death sealing half of kuroma into naruto (with the otherhalf being sealed into himself before he gets nommed by god of death).
The 3rd summons the god of death and has him devour the hands of orochimaru's soul (he wanted to get all of it, but failed). resulting in orochimaru's hands becoming paralyzed due to soul damage.
Also not homunculus, a clone. A homunculus is a magical creation with various flaws and limitations.
A clone is a technological creation which is simply an artificially made identical twin sibling.