Not that I am aware of w/o writing a special lisp app. It is possible to import multiple pdf sheets into one model. First, be sure to setup a grid with a spacing that works for the pdf sheet size. Then, turn on grid. In the reference manager, right click and select Attach PDF or choose it from the pull-down list at top left of palette. When the list of pdfs displays you can select 1, multiple specific ones or all. Have insertion point set to on-screen. Pick each grid point to set the insertion point for the pdf page. That's as close as I can get you to automating unfortunately. I suspect you actually want the pdf sheets in separate files in their own model. That being the case, my workflow is not acceptable.
As an option to try, reach out to the guy at
https://jtbworld.com/ and see if he has anything that would work for you. Sometimes these guys will throw something together for nothing or for a small fee. In your case, I would call small $200 or less small considering the time it would save you.
If you do find something, let me know.
Good luck!