OP Welcome to the FOG

What year was the house built? Is it possible there is asbestos in the popcorn ceiling? Covering it with another layer of drywall could be an option too.
Owning a Planex I might still be inclined to wet the ceiling and scrape it. Depending on how many times it's been painted it can be super fast, or a royal pain in the backside.
Does anyone know if the new Planex 2 can be used effectively with a CT26?
With limited use yes, but the bags will plug before full, and it could plug the Hepa filter over time. Using a Cyclone extractor would help some.