When you cut a headspider out of a victim, the headspider should pop back out

[Slacker Magician]

That just creates a lot of tedium to the point where it'd be more efficient to just debrain and clone the person/soon-to-be ling giving a 100% chance of the ling not taking over, rather than bothering with the chest surgery at all, which is already a crap-shoot anyways due to RNG.
On top of Changelings having enough durability and extra-lives as is imo.