“No “stirring” of the waste or shoveling it out!”
now, i grew up on a farm and I have actually shovelled shit...cow shit, horse shit, not sure how i feel about shoveling human shit...ok, i do know how i feel about shoveling human shit...eeeewww.
one might plumb a holding tank so you can dispose of the contents of the urine bottles and then pump that out occassionally. With only urine it would last a lot longer. if you still remove the plumping to the tank from the old head saving space and odour.