I’d been considering something along these lines also. If the front seats folded all the way flat, you could sleep 2. Particularly if the yoke raised up and retracted to its maximum limit.
This seems overly complicated for sleeping in the truck. Removing a seat just for a flat place to sleep sometimes seems like a lot of work. I think if there is no midgate, something as simple as the ability to slide the front seats further forward than a traditional truck does would be enough. There are lots of air mattresses that inflate a portion to fit the floor space between the front and rear seats with a flat mattress on top. Even if the truck isn't as wide as we are tall, sleeping diagonal might allow some people to fully extend.