Yes, one person may accompany you, that person will have access to the PRM area, but must have purchased the regulatory ticket.
Yes, there will be a platform at each stage meant for people with reduced mobility and their accompaniment. Depending on the amount of people there will also be chairs to rest on.
It won’t be necessary because your injury is visible. Consult the security officers.
Bring it if you wish, but if you don’t have one, don’t worry, our security officers can see your injury. If you are using crutches, wheelchair, etc. you will not have a problem getting in to the area.