this is never going to work

if you have to give priority to the slow pedestrian then you are going to be walking slower than them and you then become the slowest pedestrian and so it goes until everyone is stationary.
https://www.funkypancake.com/blog/stuff3/2006/05/IMG_9918-thumb.jpg
it’s probably best to walk down here on your own, or make sure everyone starts off by running so you’ll at least make some distance before you all grind to a gradual halt.