I'm thinking that one can't use an Ariens 10000 series Sno-Thro because an Ariens 10000 Sno-Thro doesn't have any operator presence controls. It has a "clutch lever" on the left hand-grip which is released to engage the tractor drive. Indeed the tractor's movement and the Sno-Thro attachment operation does not require an operator to be present at all!
There is a spring-loaded rod at the clutch lever's pivot. The clutch lever and the rod are individually actuated in sequence :
1. Squeeze clutch lever
2. Engage rod
Rod engagement holds the clutch in its disengaged position. This spring-loaded rod can be operated with one's thumb after one has squeezed the clutch lever.
With the clutch held in its disengaged position by the spring-loaded rod, one's arm is free to place the tractor speed shift lever (located at the right hand-grip) at any of 4 forward speed positions or neutral position or reverse position.
After the appropriate tractor speed has been selected, one can simply squeeze (momentarily) the clutch lever which enables the spring-loaded rod to release from the clutch lever pivot. Let go of the clutch lever and the tractor will travel forward, backward or remain in place (neutral) depending upon which tractor speed one have selected. An operator does not have to continually hold any operator presence control during machine operation
One might easily engage/disengage the Sno-Thro attachment with a single arm. The tractor will operate with or without the Sno-Thro attachment engaged.
An operator presence control for this machine might follow the practice used for watercraft which employs a lanyard that is pulled if the watercraft's operator becomes separated from the watercraft. One might adapt a lanyard (as employed on watercraft) to a normally-closed ignition kill-switch which has ween wired in series into the ignition coil's grounding wire circuit which has been bonded to ground.
The theory is as follows: The engine's ignition coil has a grounding wire circuit. If the grounding wire contacts the engine, frame, etc to complete the circuit then the ignition system is defeated (disabled) then there is no spark at the spark plug then the engine stops running.
The normally-closed switch contacts would be gagged open by the lanyard device. This enables the ignition system. To disable the ignition system, the lanyard is yanked away from the kill-switch and the spring-loaded, normally-closed switch contacts would come together; completing the coil grounding circuit which disables the ignition system. Boaters might securely fasten the lanyard to their body.
The Sno-Thro attachment's augers are quite powerful. Augers exert sufficient force to break up large, solid ice chunks. Shear bolts protect the auger gearbox from damage if the augers bind on tree branches, soccer balls, tire chains, newspapers, etc. The machine has absolutely no safety mechanisms to shut it down if an operator were to become entangled in the augers.