You should take a look at our newly released ADG5421F,
The ADG5421F is guaranteed off without supplies for inputs up to +/-60V.
The supply range is from 8V to 44 V for single supply and +/-5 V to +/-22 V for dual supply.
One of our recently released protection switches ADG5421F, is actually Nmos only. Have a look and see what you think.