I picked up a $999 DJI Power 1000 unit at the $417 Amazon Prime sale price that should offer me the same capability off the grid, albeit with a bit more weight and girth than your three extra batteries, beyond the Creator Combo set. LOL!
Thats a good price. You must be professional and doing a lot of flying. I have 5 batteries each for my Mavic 4 Pro and the A3S which is beyond anything I'd use in any outing.