If you have additional processing steps after InDesign I don't see a happy ending in terms of revision control and ease of changes.
I maintain a product catalog in QuarkExpress and I make sure the final output comes straight from Quark. If something needs a tweak that I can't do in Quark I do it to the source artwork (e.g. in Photoshop, Creo, or Lightwave) and re-import it. Source art is easier to Rev control with just file names.
Your example post processing -- adding a horizontal rule, resizing an image, changing a background color -- should all be doable within InDesign because I can do all those in Quark (which I am told is currently a slightly inferior page layout program).
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