What about joining page 2-3 from PDF A with page 7-23 from PDF B? I remember that being a huge hassle on macOS when I was using it years ago. Think I ended up using some cloud service/website for it since the documents weren't confidential at all.
The only downside to this, that I am aware of, is that a new PDF is created (rendered into a new PDF context). That can be lossy in some cases (if there are features that Preview does not support that get "dropped on the floor") and it is possible for the resulting PDF to be larger than the original(s).
qpdf --empty --pages a.pdf 2,3 b.pdf 7-23 -- out.pdfWithout looking it up the arguments/syntax, how do I do "join page 2-3 from PDF A with page 7-23 from PDF B"?
If it's more than one CLI invocation, easy to remember/find in the shell history and less than 80 characters long, I'm not sure I'd call it easy :)
pdfjam PDF_A.pdf '2-3' PDF_B.pdf '7-23' --outfile joined.pdf