I was hoping to achieve something similar to the stage/loft glitch (I think it's executed the same way?), where I "float" a futon mattress, to put the folded blanket at the foot of a bed, if that makes sense.

It a glitch for that still doable? It's a bit hard to google, since I don't know what type of glitch is used to do it. I've seen a couple of screenshots before of others who did similar with their beds, but I don't know how long ago they did it, or if it's been patched out.