I couldn't leave it quite that ugly

.gitignore

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+front/*
+back/*
+out/*
+*.pdf
+.vscode/settings.json

combine.py

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+import os
+import glob
+
+
+def get_ordered_files(dir_name):
+    # Get list of all files only in the given directory
+    list_of_files = filter(os.path.isfile, glob.glob(dir_name + '/*'))
+
+    # Sort list of files based on creation time in ascending order
+    list_of_files = sorted(list_of_files, key=os.path.getctime)
+
+    return list_of_files
+
+def site(path, out, reversed):
+
+    f = get_ordered_files(path)
+    if reversed:
+        f = f[::-1]
+    f = [f'"{s}"' for s in f]
+    s = ' '.join(f)
+    exec_string = f"img2pdf {s} -o {out}"
+    return exec_string
+
+
+front_out = "out/front.pdf"
+back_out = "out/back.pdf"
+merged_out = "out/merged.pdf"
+
+os.system(site("./front", front_out, False))
+os.system(site("./back", back_out, True))
+os.system(f"pdftk A={front_out} B={back_out} shuffle A B output {merged_out}")

requirements.txt

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+img2pdf