The whole reason for wanting a diglot or discript is to be able to compare and contrast the two versions side-by-side. If you want two scripts in the same book, but you don’t want them side-by-side, then I would strongly recommend not interleaving the pages between the two scripts. That would just serve to confuse the readers. Just create two separate books, one RS and one AS, and if you want to publish them in the same volume, then just combine the RS PDF with the AS PDF (with an appropriate number of blank pages between them to make the number of pages divisible by 4), and you should be able to print that PDF as a book.The RS reader opens the book to the left, and the AS reader opens the book to the right, and they only see their script as they are reading along. I personally feel, however, that it would be better in that case just to publish the texts as two separate books.