Wonder if you can use mountain climbing / rock climbing equipment for going up and down stairs

like, suppose someone in your household used to be an active outdoors type, but is now disabled… to the point they can use stairs with some difficulty, but aren’t totally confident that it’s safe

Could they put on a harness, attach a tether or rappelling equipment or whatever it’s called to some secure point on the upper floor, and thus make the stair ascent/descent safer, in the same way that the same equipment makes rock climbing safer

Is this a workable lower-tech alternative to the much more expensive (and electricity/machine-dependent) option of getting one of those stair chair lift things installed

Feel free to share/discuss, i wanna know all viewpoints on this