You might want to rethink the issue of available storage. I didn't see whether you are RWD or not, but if so, you have lots of space in the frunk. In addition, when the entire family is not riding, the rear facing seats fold down into the footwell, so you don't lose too much space in those circumstance.
A set of rear facing seats would be far cheaper than trading cars, and it might do you for years. It could get those booster seats out of the second row of seating, so you would free up as much space as the rear seats would take up anyway. If it didn't work out you could probably recover most of the cost of the seats when you sold.
Co-incidentally, I just happen to have the seats and hardware (except for the bumper reinforcement brace) for sale (LOL). PM if you are interested.