Multi-page PDFs for copyright workflow...?

I use Aperture and want to get a copyright registration workflow set up, but I can’t seem to get my head around producing mutli-page PDFs for the registration. I know I can export images and contact sheet them in Photoshop and then combine those into a multi-sheet PDF… all separate step. And that is a bit more laborious that I’d wish.

I’m correct to assume that Aperture can’t handle producing a multi-page PDF, no? (So many limitations with Aperture.) I’d really like to get something set up that can avoid the multiple steps after exporting images . Any ideas here?