What is the size of the wall you need? Sounds like you need passage, so a section must move...but not all of it. You are willing to compromise the ceiling, so any track for pocket doors, sliders, etc. would work...could even use something accordian style. At church, we built something similar. We built a temporary wall and stationed it with screws to the ceiling, wall, and floor using a wood frame which produced little repair when the wall came down. I needs to be safe if it is for a kids room.