Exactly, I would never recommend doing this. That is not what that stand is designed to do..You are missing the entire top half of the stand. With a lock-on, you step on to the foot platform.
With climber there is the whole top half you have to step over, sand then thru the seat area to the foot platform. The seat level is usually about knee high, the rail is another 12-16 inches higher. Take a good look at a picture of a climber. Yer basically gonna crotch-catch yerself if you slip.
You seem bent on doing this - good luck. Wear your harness and use a haul rope for your gear.