So what if instead of hanging an aider from each step you added a knaider to the other leg but, instead of the hook being at your knee it was extended up to your waist and attached to your belt with a retractable leash? You could then connect the hook at waist level to the step, put your weight in the aider, step up and connect the knaider on your other leg to the step. When you stood up on the next step the retractable leash would probably lift the waist level hook off of the step. This way you are wearing both aiders and nothing has to be moved from step to step. Worth a try?