The less splits the better with all those kids. We only switch with 2 kids, but I am having to make sure everything is packed up, and it’s a pain. I’d recommend getting a 2BR for the whole stay if you can. If you’re out of points, look into buying some points via a transfer. It is cheaper than you think if you try and get some SSR points. You could look into transferring points from a different resort if you have your heart set on a split stay. My recommendation is two-fold I guess:
1) minimize, or eliminate, split stay
2) buy some points and transfer them in from another owner so you can book it all at once for a 2BR