Adwords Conversion on a Per Page Basis Plugin?

Anyone have any suggestions for a way to add custom code (like adwords conversion code) to the footer on a per page basis, not a sitewide basis? Not unlike the custom meta tag information you can add on a per page basis with a plugin like all in one SEO, we need to add adwords conversion code that might be unique to a single page without using custom page templates..... seems like it should be a simple enough plugin to write if needed, but thinking someone might have already created such a plugin?

Any feedback appreciated!