I'm at home, CAD is in the office so can't copy and paste anything. I have a pagsetup LISP / series of LISPs, rather than copying from one setup to another the codes just set things. Usually we have 3 or 4 large clients and ourselves which means about 12 pagesetups (A3, A1, A0 page sizes, 4 clients) and you don't need the drawing with the template on.
I think there about about 6 things to work out and set: plotter, Paper size, Plot area, centre the plot, plot style, plot options and orientation. From what I remember all the LISPs I use to set these were downloaded - might be somethng out there that you can make up to do as you want.
With a single LISP you can apply this to a script process to change a lot of files as necessary