For a moment, I thought you were going to make a zero-movement BA, with full life support (and several days of power), that could be dropped into water. The person is stuck inside the suit, unable to move (program lockdowns), and can only stare at the %O2 and battery life remaining as those values steadily drop. Food is provided through a nutrient solution, so the person won't go hungry.
Turn off the internal dislpays so the only things for the prisoner to see are those three gauges (food, O2, and power). Now add in a bit of brainwashing through low-frequency sounds, hidden speech, random loud noises (cued when the person starts to fall asleep), and random 'suit seizures' to keep the prisoner uncomfortable.
But these designs are nice too. To me, Janitorial should be some sort of flamethrower (
Firedrake Needler?)
For the King David, how about "VIP Escort"?