Well, here’s what I’d do: Remove the password.
There’s a guide here that gives several ways of doing it:
https://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/
Most of those tools are easily accessible on the Mac, such pdftk
https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/pdftk_server-2.02-mac_osx-10.6-setup.pkg
qpdf can be installed via brew install qpdf
Same with xpdf
Set Hazel to remove the password, do what you need to do, and then delete the unprotected PDF (assuming that you’re not supposed to keep a bare copy around forever).