Dumb thought, but could they use a coaster as a transport ride, assuming cost wasn't a constraint?
Not sure how it could be done without block brakes everywhere and not having that interesting of a layout or elements so that it'd be just as likely that kids would be able to ride alongside grand parents and pretty much everyone else.
I’ve always played with this idea in my mind too (not for KD, but just as an idea in general). The biggest obstacle I keep running into, besides the cost, is what to do about loose articles. Nearly everyone carries at least a backpack or souvenir bottle around the park, and given how strict parks are regarding loose articles for even the tamest rides, I don’t know how guests would be able to transport their belongings with them.