How about cybernetics that allow the owner to pass out, or perhaps even assume a corpse-like state at will for a certain period of time? Though perhaps the latter would be complicated to code, it would allow for interesting strategies by characters in fights they don't want, or to allow for some chicanery and shenanigans to pull off heists and infiltrate/exfiltrate places as a corpse.
Presumably this would fail to fool anything but a cursory glance by laymen.
