I clearly recall pictures of the U dinette mod. May have been on a slide model, cuz they took extra steps to make the fold down sofa meet the dinette for the king bed...not sure it would help you, cause it took up more floor space, not less.
If you switch your sofa to where the dinette is now, it no longrt blocks the aisle as it does now. (If you both could sleep on it as a double bed, there would be a huge floor space where the sofa was). With the sofa swapped, you could put nothing, captains chairs, a narrow twin that elevates to watch TV, a second fold down sofa, etc.
I sense you want more floor space to open up like a slide would do. You only need about 18 more inches to open up, as that is about what a slide would give.
This is fun to consider!