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I think the placeholder might be a problem. On the other hand, you might be able to run Scott Zanelli's script to do waht you want, without a placeholder. See InDesignSecrets » Blog Archive » Zanelli Releases MultiPageImporter for Importing both PDF and INDD Files
How would the Importer deal with placement? Would it be a matter of calculating scale and placement offset before running script?
Essentially, yes, but there are some positioning options in the interface that require no calculations at all (centered, for example) for offsets. Download it and give it a look. I love it.