[WingsToDiscovery]

I can't really answer your first question but I really don't know, sorry.
For your second question, yes and no. Most major places and stations will generally provide an elevator or ramps that are wheelchair accessible, but unfortunately Japan is also a city of boutique style shops that are tight and vertically rather than horizontally due to space constraints. Tokyo is abound with stairs and tight spaces.
Also Tokyo is quite a hilly city in some places, so this may be a small problem. I've seen plenty of automatic wheelchairs that may be a reason to help alleviate this problem, but I don't know your situation. Are you traveling alone?
Public transport from what I've seen is more than accommodating. The train conductors will lay down a ramp for you and clear a path for you to get on and off the trains, allowing you very easy access on and off.