Have you considered just printing the "letterhead" in the Report Header?
Scan it into an image file if you can't reproduce it with type.
There's no convenient way to change the bin from which paper is fed while
printing a report -- not one built in to Access, anyway.
If there's a way to do what you want by using APIs, you might find it at MVP
Stephen Lebans' site, http://www.lebans.com. I don't know that there is, but
that's the first place I'd look.