The new policy specifically prohibits wagons. ADA does not cover wagons but does cover wheelchairs. https://www.ada.gov/opdmd.htm
Sorry, but you taking such an untenable position and then attempting to bludgeon others for not accepting it isnt nice.
So Keenz could consider taking an existing ADA approved wheelchair, plus it with storage and other compartments, then sell it. The challenge it to always be ahead of the chaser. As they close loopholes, the companies create new ones.
And yeah, all of us have been to Disney and seen the abuse. People would 100% buy a wheelchair with a push bar and storage to lug around their stuff, rather than a person in need.