Hi, I need some help regarding column layout in a book.

In my previous posts, people suggested using a 2+1 column layout. I started following that, but I’m running into a problem. I have a lot of text and the book must be finished within 150 pages. If I strictly use 2+1 on every page, the book will likely go up to around 250 pages.

In the example attached, I’m using a 2+1 layout on the left page, and a three column layout on the right page. I did this to accommodate more text while still keeping some structure. Images and elements also span across columns where needed.

I’m also attaching an example from my [previous project](https://www.reddit.com/r/indesign/comments/1p4ghc1/second_book_project_looking_for_feedback/#lightbox). In that layout, people mentioned that my line length was too long, which is why I started exploring multi column layouts. I mostly work on Landscape size. 

Is this kind of mixed layout acceptable in a book spread?  
Is it okay to use 2+1 on one page and 3 columns on the facing page?  
Or should both pages always follow the same column structure?

I’m mainly trying to balance readability with page count. Would really appreciate guidance.

Above image is just a reference. 

Mixing 2+1 and 3 column layout in one spread, acceptable?