Rollator with seat and brakes (Bradway, S17)

We are looking for a rollator, similar to the photo, to use in a play we are staging in May. After that we will re-list for someone else to use. Its to be used like a wheelchair to push someone on stage then needs brakes applied so it cannot move. It will not be visible so as long as it works appearance is not an issue. If anyone has one they could gift us we would be very grateful and as said previously it would then be re-gifted late May. Thank you.