Are there any recommendations for incorporating Audio Books into the activation phase of Photoreading? I.E. on spotify, listen to a specific chapter and or the entire book on the fastest speed (similar to the Photoreading audio tapes at the end of the series)?

Any thoughts, comments, or insight is greatly appreciated

I would try to get access to the PDF version of the Audio Book, and then have a couple of PhotoReads of it, and then play the audio book portion when you are in a place without distraction. As you listen, notice all the images that are triggered up into your conscious mind from and during the audio book, Create many Postviewing questions, with the positive expectation your inner mind will provide you/connect your conscious awareness to the portions of the book which answer those questions, in your case as the book is being read to you.