Sleep country, if you have them in your area, has a bed that might work. It was lasts years model called the Garcia. It's flat as a board, something like 1" of foam total, and 736 springs. I'm not sure what this years model that replaced it is called. But I think they want $900 for it. If I didn't get so hung up on the 782 springs, that I read was quality amount for an adult everyday use, I would of bought that bed. Twice they told me it had 782, after that I didn't want to deal with them. But looking back, you wouldn't have to take it apart, it has so little padding. You could just add your toppers. Good luck,