Hi! Joining in as well
I saw on a later post that you had a few meals picked out I'd think Garden grill would be awesome for your group. The characters are great for boys and girls and I think the parents of the younger three will appreciate that it's not a buffet. Bringing tiny people up to pick out food becomes such a chore!
The Bon Voyage breakfast at Trattoria has the princes and princesses, which should appeal to the boys, too. It's a short walk from the back of epcot or a bit longer to the front of HS.
I went nuts when Kohls had their Disney stuff a) on sale b) 30% off and c) a stackable 10 off of 50 on back to school. I think I have a different outfit for each day of the trip for the girls!
https://touringplans.com/walt-disney-world/ticket-calculator
There are several sites where you can get tickets cheaper than Disney direct. The touring plans link above will compare the various discount sites and tell you which one has the best price for what you need (one site might have cheaper 5 day tickets, but another is cheaper for 6, so you have to know which tickets you want, first).
We aren't doing hoppers, but we are doing 9 park days on a 10 day trip. We decided, rather than hopping, to have more days in each park but only plan to stay in a park for 3/4 of the day. We'll have resort time the rest of the day. With the size and ages of your group, the hassle of hopping between parks may just be to much. What do the parents of the littles think? They're going to have the toughest time in terms of how much the kids can handle before they need to tap out.
I couldn't get my tablet to quote it but why the 9am BOG ADR? That's the time when ride lines will be their very shortest throughout the park If you can get an 8am reservation on a day they open at 9, then you can eat and be out in time to ride at 9. Otherwise , you may want to switch that to a late breakfast or early lunch. You can take advantage of the short lines and then eat when it gets more crowded.