Not the Ritz
Yes, the most comfortable way for two adults to spend the night on my 23 is to have one in the v-berth and one in the double. The cabin sette is long enough, and the v-berth is ok if you are not much taller than 5'10". I am intrigued with the description of the 23 where the port and starboard settees both expand and meet in the middle. It really is just a sheet of plywood that slides out from under the cushion, so there is no technical reason that it couldn't be fairly easily retrofitted onto a boat. However, you would need to consider at least two things: first, expansion of the berths to make one big berth cuts off access from the v-berth to the companionway. Not necessarily bad if you don't mind guests or kids walking over you while you sleep, or if they are small and nimble enough to get out of the forward hatch. The second consideration that comes to mind are the cushions. I first looked into replacing the worn and dated coverings on my cushions when I bought the boat. I quickly found that the cost approached what I had paid for the whole boat. If you do create this new almost queen size berth, you will need to make new cushions for it, and find a place to store them aboard. Not insurmountable problems, but something to consider.