I'm going to be blunt because it won't do you any good if I sugar-coat the truth. I'm not in a position to hire anyone, so you can take my opinions for what they're worth, but my initial impression of...
My only other suggestion would be to make your page size large enough to accommodate both orientations. But again, printing this would be a nightmare if you needed the pages cut to size. If you just need a pdf, you could crop the excess off of each of the pages in Acrobat. Buda's suggestion would be easier though!
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I am wondering if what you really are asking is if you can have some pages where text/image is facing portrait and some facing landscape (where you would turn the book to read or see it in its correct orientation? If so you can do this be creating 2 separate master spreads or pages. If the document was 8.5 x 11 for example, on one master you would orient the text going across the 8.5 width and on the other it would go across the 11" height by turning the text or image 90 degrees. I hope that makes sense.
Yes I knew about the Acrobat option already, but I was working on some business card concepts and I wanted to make my job easier have portrait and landscape pages with the same document. I wouldn't send the file in that same format to the printers. It was just for conceptualising purposes.
What would you attempt to do if you knew you would not fail