Terry, may I give some thoughts on this from my experiences of testing sharpening and resizing for photo books on an HP Indigo used by Blurb.
Firstly before worrying about sharpening, getting the resizing of images correct is crucial to optimising image quality. Don't let book making software like Blurb's Booksmart or bookify resize images. Either use Photoshop or Lightroom to get the images the exact pixel dimensions of the place holders for them, then sharpen.
Photokit sharpener is the gold standard of sharpening tools, but the differences between inkjet and halftone sharpening are very subtle and you'd be lucky to see any difference between the two methods in a Book from an HP Indigo. So if I was outputting the final sized images from LR I'd just use the standard inkjet sharpening.
After several tests my preferred workflow is using the PDF to book system.
I use InDesign to layout the book and use full resolution 8bit TIFFs with capture sharpening and no output sharpening in the layout. Once the layout is finalised I use an InDesign script(
https://sites.google.com/a/lapay.biz/www/scr1-showimageproperties2) that takes all the images in the book and uses Photoshop to perfectly resize the TIFFs to the correct place holder dimensions and create a new book including the new images. It's then possible to run a Photoshop action to sharpen all the new final images with Photokit sharpener.
This workflow avoids having to go through each image and individually resize and sharpen it. I guess that assumes you won't want everything the same size on each page, so YMMV.
Paul