As I understood it, you'd have a page like this, filled with bitmaps arranged in the correct locations so that you can export/print them, and you'd like to be able to use the same layout/placement for different labels (which means just using different bitmaps)...
As that page layout is just a bunch of bitmaps in the right places (and the guides or other elements that you have), all you need to do is replace them with new bitmaps: I've drawn my three labels as vectors, I've created a bitmap copy of each one (at 600dpi), and therefore I have each of the three bitmaps in the Bitmap Gallery. I laid out the document above with the chicken label, and I have two others:
So to replace the chicken label with one of the other two, I just need to select all of the chicken bitmaps on the page (and don't have them grouped), and then from the Bitmap Gallery, right click on the new bitmap to use and select "Apply as fill"...
That immediately gives
Isn't that what you wanted to be able to do? It seems pretty simple.
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