I don't think you can you should just throw them in a freezer and wait til they rise to capture them

That should be reverse-able.

You can do it in god mode. Don’t feel so bad about using it for this purpose only - it makes sense!! I had a freezer full of immortal this and that, and none rezzing die to the spike. God mode on, pull spike out, seconds later (only when they’ve had the chance to otherwise heal themselves whilst dead) they’ll be up … and then down again. :)