Earlier quoted context omitted.
Or a stairlift. https://en.wikipedia.org/wiki/Stairlift Should be around five to ten thousand Dollar. Or you lease one for the rest of your life for about 50-100$ per month. You do the math. The electric stair climber wheelchairs are unlikely to be a competitor because of their price. But still some believe in them. https://www.digitaltrends.com/cool-tech/scewo-wheelchair-can... https://www.scewo.com/en/ But than aga…
An average stairwell is not quite wide enough to accommodate a stairlift, so I don’t think it’s a great general solution. You also still have the issue of transferring in and out of the chair, which can be an issue for some people. I bought a house on the premise that I could install a chairlift if needed … and had to sell the house a few years later when it turned out that the stairwell really wasn’t wide enough for…
About the 80 cm space required by this Vertiwalk thingy, it is roughly what a mini-elevator would need.
There is a (specific) pneumatic mini-lift that is 75 cm diameter:
https://www.vacuumelevators.com/home-elevators/
Of course this is not suited for a wheel chair, the passenger must be standing, you need 1,30/1,40 m to be wheelchair accessible.