Convert PDF pages into a printable booklet on Linux using psutils

pdf_to_booklet.sh

#! /bin/bash
#
# Use `psutils` to convert a PDF into a printable booklet.
#
# Usage:
#
#     $ ./pdf_to_booklet.sh my_file.pdf
#
# Distributed under terms of the MIT license.

DOCUMENT_MEDIA='Tabloid 792 1224'
IN_PAPER=letter

PAGE_MEDIA=$(echo $DOCUMENT_MEDIA | cut -d' ' -f1)
PAGE_SIZE=$(echo $DOCUMENT_MEDIA | cut -d' ' -f2-)

OUT_PAPER=$(echo "$PAGE_MEDIA" | tr '[:upper:]' '[:lower:]')

# Fix a known bug where `psnup` always (?) outputs `Letter`-size documents:
#
# See: https://bugs.launchpad.net/ubuntu/+source/psutils/+bug/396025
fix_psnup_media() {
  sed "s/Letter/${PAGE_MEDIA}/"
  sed "s/612 792/${PAGE_SIZE}/"
}

# Convert PDF into Postscript
pdftops -level3 -paper $IN_PAPER $1 $1.ps

# Reorder pages and place (two to a page) on larger paper
psbook -q -s4 $1.ps \
  | psnup -q -p $OUT_PAPER -P $IN_PAPER -2 \
  | fix_psnup_media \
  | ps2pdf -sPAPERSIZE=$OUT_PAPER - $1.booklet.pdf

Could the order of the pages be changed for a staple bound booklet, where I would open to the middle of the booklet and put 2 or 3 staples in the center to create its spine?

Assuming the first and last page of the PDF file is the book cover, the output PDF should go:

1st page (outside cover of booklet) - 1st and last page of original PDF
2nd page (inside cover of booklet) - 2nd and 2nd to last page of the original PDF
3rd page (outside 1st and last page of booklet) - 3rd and 3rd to last page of the original PDF
4th page (inside 1st and last page of booklet) - 4th and 4th to last page of the original PDF
...until you get to the center of the booklet and middle of the original PDF.

If the original PDF has an odd number of pages, I assume you would have to add a blank page 2nd to the last of the original PDF (as the last page of the original will be the back cover).