I was thinking a folding back seat for 1 or two people that folds flush with the back ledge would be a great option and make it more flexible for people with young kids or occasional passengers. Even if you had to scoop out a little more foot space for it. It would be a great option.
Unless it was limited to kids (ie under 5 feet) the head room just doesn’t exist. This would also require pushing the flat storage area back to make some leg room. A 2 row seating vehicle will almost certainly be the next vehicle in a few years (regardless of 3 vs 4 wheel).