+1 for this not being a good idea.
Just use a long respawn time, that way they can at least continue chatting.
But let the player use a freecam or something, don't just lock them to their corpse
I think the point is that they don't see chat and are unable to see the game in order to make it more immersive.
IMO it would be better to make something like the CRP jail scripts, and also hide all chat messages except for chat between people who are jailed. It spares the server reloading time, potential ban time, and still keeps things somewhat immersive. When they get teleported away to a "dead zone", you, the host, has freedom to customize this area—AND admin exclusions are not mandatory, but can be implemented in a more flexible manner.