In the 'end' I have to ask- Why do you think you cannot design the book on the MacBook Pro? It might save a 'ton' of problems if you could just fix some basic problems on the MDPro. What are those problems??
I've messed up and need to start Lightroom Classic on another computer
Not the solution. And a waste of time.
On the desktop, photos I sort out only the photos I want in the book. Put them in the order they need to be for the book and put them in a folder.
Create a new collection in Lightroom Classic (or fix the existing collection) and then, inside that collection, put the photos in the desired order. DO NOT try to do this in your operating system. DO NOT try to do this in a folder. DO NOT try to do this on another computer. Just do it in Lightroom Classic so that the desired photos are in one collection, and in the desired order.
Please take some time and review the free e-book for Lightroom Classic beginners at lightroomqueen.com.