I don't know. Do what you would feel comfortable with. I guess if you have already got the hopper tickets-one day less isn't going to be too bad.
I guess I would not count on the posssible upgrade that I mentioned because it could be real busy at that time.
I would recommend AKL Concierge wholeheartedley to anyone because they can take advantage of the food, PS's set up by concierge, etc. but you are just adding on to do the SS and in this case, I don't know if it's worth it. I just mean I don't know if I would spend $150 just do be able to do the SS and then pay $175 for that.
If you do book concierge, go down to the front desk early that day and see if you can "check-in" to concierge-you may have to move rooms. If they let you stay in your same room and just add the concierge access onto your current room keys then, by all means, enjoy the concierge priveledges for as long as you can.
Are you going to be at one of the parks on Monday? Would this interfere with your ability to take advantage of any of the concierge offerings that day?
Again, they may make you switch rooms. Will you be around on Monday to do that? Would it be a hassle to have to check out of your current room at 11 and not have a concierge room ready until 3 or 4?
You can always ask for an upgrade when you check-in. If you get it, then you won't have to worry about switching rooms.
Sorry to make this sound so confusing.