The way I see it, there are two options to tackle this:
(1) Get the script to read the various transformations you have made in InDesign, and then try to redo them in Photoshop, presumably using BridgeTalk. Not a trivial task -- especially the cropping.
(2) Short circuit that process and instead export the image as is in InDesign, possibly turning each image into a custom PDF (or JPG or PNG) with a page size that just matches the image. I think that would be much simpler. The PDF could then be saved alongside the original image if you like, and those PDFs could be sent to the publisher. This would presume that the images you are manipulating in InDesign are the actual hi-res images and not just thumbnails.
Both options require some good scripting done, but I think that (2) is much more straightforward than messing around with BridgeTalk and Photoshop as option (1) requires (but perhaps that's just because I'm not so familiar with Photoshop scripting).
Thank you! I am not using thumbnails at all - these are all high-res images. The publishers want tif images, though.
I don't think ID can export a page item as TIFF, but presumably Acrobat can. So all the resulting PDFs could be batch converted to TIFF in Acrobat, or, of course, in Photoshop (1 batch command should do the trick), or even, the resulting PDF could be opened in PS and saved as a TIFF with a little BridgeTalk, so you would only have to run a single script to get your desired TIFF. That last option should be fairly straightforward.
Thank you! I'll play with that option.
Again - thank you for taking the time to answer!