there's no way that Publisher can do this. I work with Publisher 2003, and a quick look through the options hasn't come up with a way round the problem.
Obviously you could copy the whole lot (all the booklets complete with any images)into a Word doc, create your template in Publisher, and then paste everything into the template. Publisher will happily flow the text and images into as many pages as it takes, but I'm sure you already know that.
Publisher will create the page numbers on the fly, because the Word doc will have created its own pages and your old Publisher page numbers will have gone (which is what you want to happen). The problem is that the resulting format won't be as you want it - Word will probably strew any lines and fancy formatting all over the place - you would have to edit your way through the entire book. Late versions of Word are pretty good with formatting, and you may get a pleasant surprise - don't hold your breath though.
I can't come up with anything more sophisticated than that I'm afraid.