Johanna,
The read-alouds that are scheduled for the history in "Beyond..." are actually good for older students as well, so if you are doing your own language arts and math for your older child, you should be able to use the left side of the plans and the storytime box of "Beyond" with both of your kiddos. I say this because the stories that we have scheduled for "Beyond..." as read-alouds, actually come from the CLP grades 3, 4, and 5 readers categories of the catalog.

The literature in the storytime box of the plans is also very rich!
The only area that will be light for your older child is the science, since Beyond uses a grade 2 CLP science book. The experiments will be plenty, but the reading will be light. You can remedy that by adding on additional reading material in science for your older child through an Apologia elementary book, a textbook, or additional living books, it's up to you.
I would also look into adding Drawn into the Heart of Reading for your older child in the area of literature study (unless you already have that covered in your language arts).
Blessings,
Carrie