Yeah, three-wheeled bikes still count as bikes imo, they're much closer to being bikes than cars.

But I have nothing against powered wheelchair obviously, they aren't cars.

There are disability adapted bikes that cover a wide range of physical disabilities (I've seen up to even only a single arm and head movements). I'm curious what disabilities would actually require exclusively a car for transportation and for which custom bikes wouldn't be enough, do you know of any ?

KeePassXC does have this functionality on desktop as well as on SOME android apps (no idea for iOS). For android I like KeePass2Android Offline, iirc it was recommended on the official KeePassXC website (you may want to check it out).