I am in love with the Keenze and the push is Amazing! The only reason we didn’t purchase was because the youngest of our 6 children are 5 and 2.5.
The Keenz is ALLOWED in the park because of the push option. There are many FB posts about the Stroller Wagon in Disney Parks in the Kneez FB group, which you should join.
Many on this Fourm don’t know much about Strollers and I bite my toung often when parents of one kid who have taken two trips recommend a crap stroller. We have 25+ trips in 15 years and only two with out a stroller. Keenze is a new Stroller on the markets that has a harness for riders, and it pushes like a stroller. Some had been stopped by parking lot attendants but have been admitted into the parks by security.
Heck do a google search and you will see pics of them in the parks.
If my babies were younger I would do this. Some things to know: UppaBaby cup holders work on the frame and there are quite a few Ikea Hacks to make a washable liner.
Anyway have a Magical vacation