Or you could get the Acrobat full version. Adobe Acrobat is one of my most used tools, and I've done (and still do) what you are attempting to do. I scan in the image, convert it to pdf (print to pdf). Then, open up Acrobat, select "Insert pages" from the Document menu, and select where I want to add the page(s). It's that simple.
Of Course, the full version of Acrobat does so much more, and buying it is well worth it (IMO).
What is lacking: I want a reliable OCR program (so I can have a searchable pdf file) ... but I've not found one that I like.