I think the skycouch is an excellent way to take young children on a long distance flight.
It’s the best option for them to get good hours of sleep. You would have to have two rows, as a parent must be with each child. You can lie with a child and settle them, and possibly with the wee one actually stay there and nap yourself. Your older child should also will be very comfortable but you may have to just sit at the end of that row, or rest with them.
I love the skycouch, have slept in them better than business class lie flat beds. It seemed to be darker as it was lower down.