Platform bed frame, bunkie board, split box spring, or slat roll?

I can’t fit my queen box spring up my staircase (and there’s no good way to detach the rail – old house). Which of the options I listed would you choose? Or is there another option I don’t know about?

I used to sleep on a king that had a split box spring, and it created a hump in the middle of the mattress after a few years – is that an inevitable result of a split box, or was my setup just too old?

I’ve been told that a slat roll might not provide enough support for, ahem, vigorous use – truth?

It’d be nice to avoid buying a whole new platform frame, so I’m hoping one of the other three options will work. My current frame is just one of those metal slide-together types that’s meant to work with a box spring.